# Levers And Pulleys 2-5-12

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• 1.

### Class 1- Lever:

• A.

A lever in which fulcrum is between the load and effort

• B.

A lever in which the load is between the filter and effort

• C.

A ratio of the load or resistance to the effort of force.

• D.

Two or more pulleys working together.

A. A lever in which fulcrum is between the load and effort
Explanation
This answer is correct because it accurately describes a class 1 lever. In a class 1 lever, the fulcrum is located between the load and the effort. This means that the lever pivots around the fulcrum, and the effort is applied on one side of the fulcrum to overcome the load on the other side. This type of lever is commonly seen in tools such as seesaws and crowbars.

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• 2.

### Class 2- Lever:

• A.

A lever in which the load is between the filcrum and effort.

• B.

• C.

A ratio of the load or resistance to the effort of force.

• D.

Two or more pulleys working together.

A. A lever in which the load is between the filcrum and effort.
Explanation
This answer correctly describes a class 2 lever. In a class 2 lever, the load is located between the fulcrum (or pivot point) and the effort (or force applied). This means that the load is closer to the fulcrum than the effort, resulting in a mechanical advantage. Examples of class 2 levers include a wheelbarrow and a nutcracker.

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• 3.

### Lever:

• A.

• B.

A beam, free to pivot around a point used to move a load.

• C.

A ratio of the load or resistance to the effort of force.

• D.

Two or more pulleys working together.

B. A beam, free to pivot around a point used to move a load.
Explanation
The correct answer is "A beam, free to pivot around a point used to move a load." This is because a lever is a simple machine consisting of a rigid bar or beam that is able to rotate around a fixed point called the fulcrum. It is used to apply a force, known as the effort, to move or lift a load. The load is placed on one end of the lever, while the effort is applied on the other end. The fulcrum acts as a pivot point, allowing the lever to move and exert a mechanical advantage to move the load with less effort.

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• 4.

### Lever Arm:

• A.

• B.

A beam, free to pivot a point.

• C.

A Machine that is designed using a number of simple machines, oftem run by a motor.

• D.

Two or more pulleys working together.

B. A beam, free to pivot a point.
Explanation
The correct answer is "A beam, free to pivot at a point." This is because a lever arm is a simple machine that consists of a rigid bar or beam that is able to rotate freely around a fixed point called the fulcrum. The lever arm allows for the application of a force at one end (effort) to move a load at the other end. The beam pivots or rotates around the fulcrum, enabling the transfer of force and motion.

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• 5.

### Complex Machine:

• A.

A Machine that is designed using a number of simple machines, often run by a motor.

• B.

• C.

Another name for a "Pulley System".

• D.

The metric unit used to measure force.

A. A Machine that is designed using a number of simple machines, often run by a motor.
Explanation
The correct answer is a machine that is designed using a number of simple machines, often run by a motor. This explanation accurately describes a complex machine as a combination of multiple simple machines working together, often powered by a motor. Complex machines are typically designed to perform more complicated tasks and are commonly found in various industries and everyday appliances.

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• 6.

### Class 3 - Lever:

• A.

A lever in which the effort is between the fulcrum and load.

• B.

• C.

A pulley in which the effort is between the fulcrum and load.

• D.

A slope in which the effort is between the fulcrum and load.

A. A lever in which the effort is between the fulcrum and load.
Explanation
The correct answer is "A lever in which the effort is between the fulcrum and load." This is because in a Class 3 lever, the effort is applied between the fulcrum (the pivot point) and the load (the object being moved). This type of lever is commonly seen in situations where the effort is focused on increasing speed or range of motion, rather than maximizing force.

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• 7.

• A.

• B.

A lever in which the load is between the filcrum and effort

• C.

A positive effect over another.

• D.

A gain in effort or distance or change or direction resulting from the use of a "Simple Machine".

D. A gain in effort or distance or change or direction resulting from the use of a "Simple Machine".
Explanation
The correct answer is "A gain in effort or distance or change in direction resulting from the use of a 'Simple Machine'." This answer accurately describes the concept of advantage in the context of simple machines. It explains that advantage refers to the positive effect achieved by using a simple machine, which can be in the form of increased effort, increased distance, or a change in direction. This definition aligns with the understanding that simple machines are designed to make tasks easier or more efficient.

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• 8.

### Block and Takle:

• A.

A Machine that is designed using a number of simple machines, oftem run by a motor.

• B.

• C.

A lever in which the load is between the filcrum and effort

• D.

Another name for a "Pulley Sytem".

D. Another name for a "Pulley Sytem".
Explanation
The correct answer is "Another name for a 'Pulley System'". The given options describe different types of machines, such as a machine designed using simple machines, a lever with the fulcrum between the load and effort, and a lever with the load between the fulcrum and effort. However, the answer option states that it is another name for a "Pulley System", which is a type of machine used to lift or move objects using a combination of pulleys and ropes or cables.

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• 9.

### Simple Machine:

• A.

Any of the six elementary devices including (lever and pulley) that provide mechanical or other advantage.

• B.

• C.

A lever in which the load is between the filcrum and effort

• D.

A Machine that is designed using a number of simple machines, oftem run by a motor.

A. Any of the six elementary devices including (lever and pulley) that provide mechanical or other advantage.
Explanation
The correct answer is "Any of the six elementary devices including (lever and pulley) that provide mechanical or other advantage." This answer accurately describes a simple machine as one of the six elementary devices that can provide mechanical or other advantages. It includes examples of simple machines such as levers and pulleys, which are commonly known examples of simple machines.

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• 10.

### Slope:

• A.

• B.

A lever in which the load is between the filcrum and effort

• C.

The Slant of an inclined plane.

• D.

The area you go skiing on with snow.

C. The Slant of an inclined plane.
Explanation
The correct answer is "The Slant of an inclined plane." This is because slope refers to the slant or incline of an inclined plane. It is a measure of how steep or gradual the incline is. In physics and mathematics, slope is often used to calculate the rate of change or the steepness of a line or surface. In the context of skiing, slope refers to the area or terrain where people go skiing on with snow.

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• 11.

### Newton:

• A.

A famous scientist

• B.

An inclined plane spiraled around an axis.

• C.

A machine that uses two levers working together.

• D.

The metric unit used to measune force.

D. The metric unit used to measune force.
Explanation
The statement "The metric unit used to measure force" is the correct answer because Newton is the metric unit used to measure force in the International System of Units (SI). It is named after Sir Isaac Newton, the famous scientist who formulated the laws of motion and made significant contributions to the understanding of force.

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• 12.

### Pulley:

• A.

A wheel with a grooved rim in which rope can run to change the direction of the pull and so lift a load.

• B.

An inclined plane spiraled around an axis.

• C.

A machine that uses two levers working together.

• D.

An opposing force tending to prevent motion.

A. A wheel with a grooved rim in which rope can run to change the direction of the pull and so lift a load.
Explanation
The correct answer is a wheel with a grooved rim in which a rope can run to change the direction of the pull and lift a load. This definition accurately describes a pulley, which is a simple machine commonly used to lift heavy objects. By using a rope or cable that runs along the grooved rim of the pulley, the direction of the force applied can be changed, making it easier to lift the load. This explanation aligns with the definition provided and accurately describes the function and purpose of a pulley.

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• 13.

### Screw:

• A.

An inclined plane spiraled around an axis.

• B.

A machine that uses two levers working together.

• C.

An opposing force tending to prevent motion.

• D.

A scale used to compare masses placed at equal distances from fulcrum.

A. An inclined plane spiraled around an axis.
Explanation
The correct answer is "An inclined plane spiraled around an axis." This is because a screw is essentially an inclined plane wrapped around a cylindrical axis. When the screw is rotated, it moves through a material, creating a mechanical advantage that allows it to lift or hold objects in place. This explanation aligns with the definition and characteristics of a screw.

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• 14.

### Resistance:

• A.

An opposing force tending to prevent motion.

• B.

A machine that uses two levers working together.

• C.

A scale used to compare masses placed at equal distances from fulcrum.

• D.

A. An opposing force tending to prevent motion.
Explanation
The correct answer is "An opposing force tending to prevent motion." This is because resistance refers to a force that acts in the opposite direction to the motion of an object, making it difficult to move or change its speed. In the context of the given options, the other choices do not accurately define resistance. A machine that uses two levers working together describes a compound lever system, a scale used to compare masses placed at equal distances from the fulcrum refers to a balance or equal-arm balance, and a lever in which the fulcrum is between the load and effort is known as a first-class lever.

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• 15.

### Fulcrum:

• A.

The point at which a lever arm pivots.

• B.

Two or more pulleys working together.

• C.

A machine that uses two levers working together.

• D.

An opposing force tending to prevent motion.

A. The point at which a lever arm pivots.
Explanation
The correct answer is "The point at which a lever arm pivots." This is because a fulcrum is indeed the point on which a lever rests or is supported and around which it can pivot. It acts as a pivot point for the lever arm, allowing it to rotate and generate mechanical advantage. The other options mentioned, such as pulleys working together or a machine using two levers, do not accurately define a fulcrum.

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• 16.

### Inclined Plane:

• A.

An opposing force tending to prevent motion.

• B.

A flat surface set at an angle used to chnage the direction of a force.

• C.

Two or more pulleys working together.

• D.

A machine that uses two levers working together.

B. A flat surface set at an angle used to chnage the direction of a force.
Explanation
The correct answer is "A flat surface set at an angle used to change the direction of a force." This is because an inclined plane is a simple machine that consists of a flat surface that is set at an angle. It is used to reduce the amount of force required to move an object by changing the direction of the force. When an object is placed on an inclined plane, the force required to move it is spread out over a longer distance, making it easier to move the object.

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• 17.

### Force:

• A.

An inclined plane spiraled around an axis.

• B.

A machine that uses two levers working together.

• C.

A Push or Pull.

• D.

An opposing force tending to prevent motion.

C. A Push or Pull.
Explanation
The correct answer is "A Push or Pull." This is because force is defined as a push or a pull that can cause an object to move, change direction, or stop. It is a fundamental concept in physics and is measured in units called newtons. The other options, such as an inclined plane spiraled around an axis or a machine that uses two levers, do not accurately describe the concept of force.

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• 18.

### Fixed Pulley:

• A.

A machine that uses two levers working together.

• B.

An inclined plane spiraled around an axis.

• C.

Two or more pulleys working together.

• D.

A pulley attached in posistion above a load to be lifted.

D. A pulley attached in posistion above a load to be lifted.
Explanation
The correct answer is "A pulley attached in position above a load to be lifted." This is because a fixed pulley is a type of pulley that is attached to a fixed point above the load that needs to be lifted. It does not involve any additional levers or inclined planes. The fixed pulley simply changes the direction of the force applied to lift the load, making it easier to lift.

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• 19.

### Effort:

• A.

An inclined plane spiraled around an axis.

• B.

A machine that uses two levers working together.

• C.

• D.

The force applied to move a load using a "Simple Machine"

D. The force applied to move a load using a "Simple Machine"
Explanation
This answer is correct because it accurately describes the concept of a simple machine. A simple machine is a mechanical device that can change the direction or magnitude of a force to make work easier. It typically consists of a few basic parts, such as a lever, inclined plane, pulley, wheel and axle, wedge, or screw. By applying a force, known as effort, to a simple machine, it can be used to move a load or overcome resistance with less effort than would be required without the machine. Therefore, the force applied to move a load using a "Simple Machine" is an accurate explanation.

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• 20.

### Double Lever:

• A.

A machine that uses two levers working together.

• B.

An opposing force tending to prevent motion.

• C.

An inclined plane spiraled around an axis.

• D.

The weight or resistance that is moved using a simple machine.

A. A machine that uses two levers working together.
Explanation
The correct answer is "A machine that uses two levers working together." This explanation aligns with the definition of a double lever provided in the question. It states that a double lever is a machine that utilizes two levers working in conjunction. The other options mentioned in the question, such as an opposing force, inclined plane, and weight or resistance, do not accurately describe a double lever.

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• 21.

### Coumpound Pulley:

• A.

An inclined plane spiraled around an axis.

• B.

The weight or resistance that is moved using a simple machine.

• C.

One pulley working together.

• D.

Two or more pulleys working together.

D. Two or more pulleys working together.
Explanation
The correct answer is two or more pulleys working together. This is because a compound pulley system consists of multiple pulleys that are connected and work in conjunction to increase mechanical advantage. By distributing the load across several pulleys, the force required to lift or move the weight is reduced. This makes it easier to lift heavy objects or overcome large resistances.

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• 22.

### Equal Arm Balance:

• A.

An inclined plane spiraled around an axis.

• B.

The weight or resistance that is moved using a simple machine.

• C.

A plane used to compare masses placed at large distances from fulcrum.

• D.

A scale used to compare masses placed at equal distances from fulcrum.

D. A scale used to compare masses placed at equal distances from fulcrum.
Explanation
The correct answer is a scale used to compare masses placed at equal distances from the fulcrum. This is because an equal arm balance is a type of weighing scale that has two pans or trays suspended from a central fulcrum. The masses to be compared are placed on each side of the fulcrum, and the scale balances when the masses are equal. This type of balance is commonly used in laboratories and other settings where precise measurements of weight are required.

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• 23.

• A.

How much dirt is in the truck

• B.

The weight or resistance that is moved using a simple machine.

• C.

A ratio of the load or resistance to the effort of force.

• D.

A lever in which the effort is between the fulcrum and load.

B. The weight or resistance that is moved using a simple machine.
Explanation
The correct answer is "The weight or resistance that is moved using a simple machine." This is because the definition of load in the given context refers to the weight or resistance that is being moved with the help of a simple machine. It is the object or material that is being lifted, transported, or manipulated by the machine.

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• 24.

• A.

A ratio of the load or resistance to the effort of force.

• B.

The weight or resistance that is moved using a simple machine.

• C.

A lever in which the effort is between the fulcrum and load.

• D.

A positive effect over another

A. A ratio of the load or resistance to the effort of force.
Explanation
The correct answer is "A ratio of the load or resistance to the effort of force." This explanation accurately describes the concept of mechanical advantage. Mechanical advantage is a measure of how much a machine multiplies the force or effort applied to it. It is calculated by dividing the load or resistance by the effort of force. This ratio helps determine the effectiveness of a machine in making work easier.

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• 25.

### Wedge:

• A.

A ratio of the load or resistance to the effort of force.

• B.

A double inclined plane that tapers to a point or sharp edge used to change the direction or force.

• C.

Two Wheels of a diffrent diameter attached and rotating on the same axis

• D.

A Triple inclined plane that tapers to a point or sharp edge used to change the direction or force.

B. A double inclined plane that tapers to a point or sharp edge used to change the direction or force.
Explanation
The correct answer is a double inclined plane that tapers to a point or sharp edge used to change the direction or force. This is because a wedge is a simple machine that is often shaped like a triangle or a trapezoid, with one or two inclined surfaces. The tapering shape allows the wedge to exert a large amount of force over a small area, making it useful for splitting or cutting objects. By inserting the wedge into a material and applying force to it, the direction of the force is changed, allowing for tasks such as splitting wood or cutting through food.

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• 26.

### Wheel and Axle:

• A.

Three diffrent diameter attached and rotating on the same axis

• B.

A ratio of the load or resistance to the effort of force.

• C.

A machine that uses two levers working together.

• D.

Two Wheels of a diffrent diameter attached and rotating on the same axis

D. Two Wheels of a diffrent diameter attached and rotating on the same axis
Explanation
The correct answer is "Two Wheels of a different diameter attached and rotating on the same axis." This is because a wheel and axle is a simple machine that consists of two circular objects, with one being larger (the wheel) and the other being smaller (the axle), attached and rotating on the same axis. The difference in diameter between the wheel and axle allows for mechanical advantage, making it easier to move or lift heavy objects.

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• 27.

### List of "Simple Machines"

• A.

Lever

• B.

Wheel and Axle

• C.

Pulley

• D.

Inclined Plane

• E.

Wedge

• F.

Screw

• G.

Car

• H.

Boat

• I.

Motorcyle

• J.

Computer

A. Lever
B. Wheel and Axle
C. Pulley
D. Inclined Plane
E. Wedge
F. Screw
Explanation
The given list includes various examples of simple machines. A lever is a simple machine that consists of a rigid bar that rotates around a fixed point called a fulcrum. The wheel and axle is another simple machine that consists of a wheel attached to a rod called an axle. A pulley is a simple machine that uses a wheel with a groove and a rope or chain to lift or move objects. An inclined plane is a simple machine that is a flat surface with one end higher than the other, used to move objects up or down. A wedge is a simple machine that is a triangular-shaped object used to split or hold objects together. A screw is a simple machine that is an inclined plane wrapped around a cylinder.

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• 28.

### Simple Mechines make-up Complex Mechines?

• A.

True

• B.

False

A. True
Explanation
Simple machines are the building blocks of complex machines. Complex machines are made up of multiple simple machines working together to perform a more complicated task. This is because simple machines provide mechanical advantage, allowing us to multiply or redirect forces to make tasks easier. Examples of simple machines include levers, pulleys, wheels and axles, inclined planes, wedges, and screws. By combining these simple machines, we can create complex machines like cars, cranes, and bicycles. Therefore, it is true that simple machines make up complex machines.

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• 29.

### A lever in which fulcrum is between the load ad effort

class 1 lever
Explanation
A class 1 lever is a type of lever where the fulcrum is positioned between the load and the effort. In this lever, the load is on one side of the fulcrum, and the effort is applied on the other side. When the effort is greater than the load, the lever can be used to lift heavy objects with less force. This lever is commonly seen in tools like seesaws and crowbars.

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• 30.

### A lever in which the load is between the filcrum and effort.

class 2 lever
Explanation
A class 2 lever is characterized by having the load positioned between the fulcrum (pivot point) and the effort (force applied to move the lever). In this type of lever, the load is closer to the fulcrum than the effort, which allows for greater mechanical advantage. This means that a smaller effort can be applied to move a larger load. Examples of class 2 levers include wheelbarrows and bottle openers.

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• 31.

### A beam, free to pivot around a point used to move a load.

lever
Explanation
A lever is a simple machine that consists of a rigid bar or beam that is free to pivot around a fixed point called a fulcrum. It is used to move a load by applying a force at one end of the lever, while the load is located at the other end. The lever allows for the amplification of force, making it easier to lift or move heavy objects. In this scenario, the beam is able to pivot around a point, indicating that it is acting as a lever.

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• 32.

lever arm
• 33.

### A Machine that is designed using a number of simple machines, oftem run by a motor.

complex machine
Explanation
The given answer, "complex machine," is the correct explanation for the description provided. The description mentions that the machine is designed using a number of simple machines and is often run by a motor. This implies that the machine is made up of multiple interconnected components, making it more intricate and advanced than a single simple machine. Therefore, the term "complex machine" accurately describes the given description.

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• 34.

### A lever in which the effort is between the fulcrum and load.

class 3 lever
Explanation
A class 3 lever is a type of lever where the effort is applied between the fulcrum and the load. In this lever, the load is closer to the fulcrum than the effort. This means that the effort arm is longer than the load arm, resulting in a mechanical advantage less than 1. Class 3 levers are commonly found in everyday objects like brooms and tweezers, where a small effort can be used to move a larger load over a shorter distance.

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• 35.

### A gain in effort or distance or change or direction resulting from the use of a "Simple Machine".

Explanation
The term "advantage" refers to a gain in effort, distance, change, or direction that is achieved by using a "Simple Machine." In other words, when utilizing a simple machine, such as a lever or pulley, it allows for an advantage by making tasks easier or more efficient. This advantage is obtained by leveraging the principles of physics and mechanics to amplify or redirect forces, ultimately reducing the amount of effort required to perform a task.

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• 36.

### Another name for a "Pulley Sytem".

block and tackle
Explanation
A "block and tackle" is another name for a pulley system. This system consists of one or more pulleys, or blocks, that are used to change the direction or multiply the force applied to a load. By using multiple pulleys and ropes, a block and tackle can provide a mechanical advantage, making it easier to lift heavy objects. The term "block and tackle" is commonly used in industries such as construction, sailing, and rigging.

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• 37.

### Any of the six elementary devices including (lever and pulley)

simple machine
Explanation
The given correct answer is "simple machine". This is because a simple machine is a basic mechanical device that helps in performing work. It can be any of the six elementary devices, including the lever and pulley mentioned in the question. These devices are considered simple machines because they have few or no moving parts and can be used to multiply or change the direction of force, making work easier.

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• 38.

### The Slant of an inclined plane.

slope
Explanation
The term "slope" refers to the slant or incline of an inclined plane. It represents the steepness or angle of the plane's surface. The slope is a measure of how much the plane rises or falls vertically for every unit of horizontal distance. It is commonly represented as a ratio or a percentage. Therefore, the answer "slope" accurately describes the slant of an inclined plane.

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• 39.

### The metric unit used to measune force.

newton
Explanation
The metric unit used to measure force is the newton. The newton is defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. It is named after Sir Isaac Newton, a renowned physicist who made significant contributions to the study of mechanics and motion. The newton is commonly used in fields such as physics and engineering to quantify and describe forces acting on objects.

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• 40.

### A wheel with a grooved rim in which rope can run to change the direction of the pull and so lift a load.

pulley
Explanation
A pulley is a device that consists of a wheel with a grooved rim. It is used to change the direction of the pull and lift a load. The grooved rim allows a rope or cable to run along it, providing a mechanical advantage to lift heavy objects. By utilizing the pulley system, the force required to lift the load is reduced, making it easier to lift heavy objects.

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• 41.

### An inclined plane spiraled around an axis.

screw
Explanation
A screw is a simple machine that consists of an inclined plane wrapped around a cylindrical axis. As the screw is turned, it moves through a material, such as wood or metal, creating a threaded hole or fastening two objects together. The spiral shape of the inclined plane allows the screw to exert a mechanical advantage, making it easier to drive into a material or hold objects tightly together. Therefore, the given description of an inclined plane spiraled around an axis aligns with the characteristics of a screw.

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• 42.

### An opposing force tending to prevent motion.

resistance
Explanation
Resistance is the opposing force that acts against motion. It is a force that tends to hinder or impede the movement of an object. When an object encounters resistance, it requires more energy or force to overcome it and continue moving. Resistance can be caused by various factors such as friction, air resistance, or the resistance of a medium through which an object is moving. In physics, resistance is an important concept that is often encountered when studying the motion of objects.

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• 43.

### The point at which a lever arm pivots.

fulcrum
Explanation
The correct answer is fulcrum. A fulcrum is the point on which a lever arm pivots. It acts as a support or a fixed point around which the lever arm can rotate. In other words, it is the point of balance or the point of rotation for a lever. Without a fulcrum, a lever would not be able to function properly as it relies on this point to provide stability and enable movement.

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• 44.

### A flat surface set at an angle used to chnage the direction of a force.

inclined plane
Explanation
An inclined plane is a flat surface that is set at an angle, which allows it to change the direction of a force. When an object is placed on an inclined plane, it can be moved up or down the plane by applying a force parallel to the plane's surface. The angle of the inclined plane determines the amount of force required to move the object. This simple machine is commonly used in various applications, such as ramps, stairs, and slides, to make it easier to move objects vertically or horizontally.

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• 45.

### A Push or Pull.

force
Explanation
The given answer "force" is the correct answer because it is the term used to describe a push or pull that can cause an object to move, stop, or change direction. In physics, force is defined as any interaction that can change the motion of an object. It can be measured in units such as Newtons and can have different magnitudes and directions. Therefore, force is the appropriate term to describe a push or pull.

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• 46.

### A pulley attached in posistion above a load to be lifted.

fixed pulley
Explanation
A fixed pulley is attached in a stationary position above the load to be lifted. This type of pulley does not move and only changes the direction of the force applied. It allows for easier lifting by distributing the weight of the load evenly.

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• 47.

### The force applied to move a load using a "Simple Machine"

effort
Explanation
The correct answer is "effort" because when using a simple machine, such as a lever or pulley, a force or effort is applied to move a load. The effort is the force exerted by the person or machine to overcome resistance and move the load. It is the input force required to operate the simple machine and achieve the desired outcome.

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• 48.

### A machine that uses two levers working together.

double lever
Explanation
A double lever refers to a machine that utilizes two levers working in conjunction with each other. This type of lever system allows for increased mechanical advantage and efficiency in performing tasks. By combining the efforts of two levers, the machine can achieve a greater output force or distance compared to a single lever. This design is commonly used in various applications, such as seesaws, wheelbarrows, and pliers, where the coordinated movement of two levers enhances the overall performance of the machine.

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• 49.

### Two or more pulleys working together.

compound pulley
Explanation
A compound pulley refers to a system of two or more pulleys that work together to increase mechanical advantage. This arrangement allows for a smaller force to be applied over a longer distance in order to lift or move a heavier load. Each pulley in the compound pulley system is attached to a different part of the load, creating a mechanical advantage that makes the task easier.

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### A scale used to compare masses placed at equal distances from fulcrum.

equal arm balance
Explanation
An equal arm balance is a type of scale that is designed to compare masses. It has two arms that are of equal length and are placed at equal distances from the fulcrum. This allows for the masses to be balanced and compared accurately.

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