# Work And Energy Period 1

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Quizzes Created: 12 | Total Attempts: 3,001
Questions: 28 | Attempts: 115

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Multiple Choice and Fill in questions

• 1.

### A boy pushes on a parked car with a force of 200 N. The car does not move.  How much work does the boy do on the car?

• A.

0 N

• B.

200 N

• C.

Can't be determined

• D.

200 J

A. 0 N
Explanation
No work is done because the car does not move

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• 2.

### What are the units of work?

• A.

N-m

• B.

J

• C.

All of these answers

• D.

Kg-m2/s2

C. All of these answers
Explanation
The correct answer is "All of these answers" because work can be measured in different units depending on the context. N-m (Newton-meter) is the unit of work in the metric system, J (Joule) is the unit of work in the International System of Units (SI), and kg-m2/s2 (kilogram-meter squared per second squared) is the unit of work in the context of rotational motion. Therefore, all of these units can be used to measure work.

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• 3.

### Which of the following processes requires the most work?

• A.

A 10 kg ball is rolled across the floor at a constant speed for 10 m

• B.

A person holds a 1kg weight still with outstretched arms

• C.

A person lifts a 1 kg weight 1 m off the floor

• D.

A 10 kg weight rests on a table

C. A person lifts a 1 kg weight 1 m off the floor
Explanation
The process that requires the most work is when a person lifts a 1 kg weight 1 m off the floor. Work is defined as the product of force and displacement in the direction of the force. In this case, the force required to lift the weight is equal to the weight itself (1 kg weight = 9.8 N force). The displacement is 1 m. Therefore, the work done is equal to the force multiplied by the displacement, which is 9.8 N * 1 m = 9.8 Joules. This is greater than the work required for any of the other processes mentioned.

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• 4.

### What are the units of power

• A.

Watts

• B.

Joules per second

• C.

Horsepower

• D.

All of these choices

D. All of these choices
Explanation
The units of power can be expressed in watts, joules per second, or horsepower. Power is the rate at which work is done or the amount of energy transferred per unit of time. Watts is the SI unit for power, representing one joule of energy transferred per second. Joules per second is another way to express power, as it directly represents the amount of energy transferred per unit of time. Horsepower is a non-SI unit commonly used to measure power, especially in the context of engines and motors. Therefore, all of these choices are correct units for power.

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• 5.

### Which of the following is NOT a simple machine

• A.

A lever

• B.

A pair of scissors

• C.

A wheel and axle

• D.

A screw

B. A pair of scissors
Explanation
a pair of scissors is a compound machine

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• 6.

### Which of the following is not in the inclined plane family

• A.

A wedge

• B.

A ramp

• C.

A screw

• D.

A wheel and axle

D. A wheel and axle
Explanation
The wheel and axle is not in the inclined plane family because it is a simple machine that consists of a wheel attached to a rod or axle. In contrast, the inclined plane family includes machines that use a sloping surface to reduce the effort needed to move objects vertically or horizontally, such as wedges, ramps, and screws. The wheel and axle operates using rotational motion rather than the principle of inclined planes.

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• 7.

### Which of the following is a compound machine?

• A.

A wheel and axle

• B.

A pair pf pliers

• C.

A pulley

• D.

A ramp

B. A pair pf pliers
Explanation
A pair of pliers is considered a compound machine because it consists of two simple machines combined together. The two simple machines in pliers are the lever and the wedge. The handles of the pliers act as a lever, allowing for increased force to be applied to the object being gripped. Additionally, the jaws of the pliers have a wedge shape, which helps in gripping and holding objects securely. Therefore, the combination of these two simple machines makes a pair of pliers a compound machine.

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• 8.

### Which of the following statements about work and energy is NOT true?

• A.

When work is done, energy is transferred or transformed

• B.

Energy may be defined as the ability to do work

• C.

Work and energy are always equal

• D.

Work and energy have the same units

C. Work and energy are always equal
Explanation
The statement "work and energy are always equal" is not true. Work and energy are related concepts, but they are not always equal. Work is the transfer of energy that occurs when a force is applied to an object and it moves in the direction of the force. Energy, on the other hand, is the ability to do work. They have the same units (joules), but they are not always equal in value.

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• 9.

### Gravitation potential energy depends on the.....

• A.

Height of the object

• B.

Acceleration due to gravity

• C.

The mass of the object

• D.

All of these choices

D. All of these choices
Explanation
Gravitational potential energy depends on the height of the object because the higher an object is lifted, the greater its potential energy. It also depends on the acceleration due to gravity because the force of gravity determines the amount of potential energy an object possesses. Additionally, the mass of the object affects its gravitational potential energy because a heavier object will have more potential energy than a lighter object at the same height. Therefore, all of these choices affect gravitational potential energy.

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• 10.

### The kind of energy associated with the atomic bomb is.....

• A.

Chemical energy

• B.

Light energy

• C.

Kinetic energy

• D.

Mechanical energy

A. Chemical energy
Explanation
All energy is considered chemical or mechanical

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• 11.

### The primary source of the sun's energy is....

• A.

Chemical energy

• B.

Nuclear fusion

• C.

Nuclear fission

• D.

Potential energy

B. Nuclear fusion
Explanation
The primary source of the sun's energy is nuclear fusion. Nuclear fusion is the process in which two or more atomic nuclei come together to form a heavier nucleus, releasing a large amount of energy in the process. In the sun, hydrogen nuclei combine to form helium, releasing a tremendous amount of energy in the form of light and heat. This process occurs in the sun's core, where the temperature and pressure are extremely high. Chemical energy, nuclear fission, and potential energy are not the primary sources of the sun's energy.

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• 12.

### A pendulum is swinging back and forth and has a kinetic energy of 400 J at a particular point in it's path.  Which of the following statements is not true?

• A.

Both kinetic and potential energy are decreasing

• B.

The minimum kinetic energy is zero

• C.

The potential energy increases when the kinetic energy decreases

• D.

When the potential energy is zero, the potential energy will be 400 J greater

A. Both kinetic and potential energy are decreasing
Explanation
if both were decreasing it would violate the law of conservation of energy

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• 13.

### The law of conservation of energy states that.......

• A.

Energy can not change form

• B.

It is impossible to make a perpetual motion machine

• C.

The energy of a system can disappear

• D.

Energy can be neither created or destroyed

D. Energy can be neither created or destroyed
Explanation
The law of conservation of energy states that energy can be neither created nor destroyed. This means that the total amount of energy in a closed system remains constant over time. Energy can only be transferred or transformed from one form to another. This principle is fundamental in physics and is often used to analyze and understand various phenomena, such as energy transfer in mechanical systems, chemical reactions, and electromagnetic radiation.

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• 14.

### _____________________ is a quantity that measures the effects of a force acting over a distance

work
Work
WORK
Explanation
Work is the correct answer because it is a quantity that measures the effects of a force acting over a distance. Work is calculated by multiplying the force applied to an object by the distance the object moves in the direction of the force. It is a measure of energy transfer and is expressed in units of joules (J). The capitalization of the answer options does not affect the correctness of the answer.

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• 15.

### ______________________ is a quantity that measures the rate at which work is done

power
Power
POWER
Explanation
Power is the correct answer for this question. Power is a quantity that measures the rate at which work is done. It is the amount of work done per unit of time. Power is often expressed in units of watts (W), where 1 watt is equal to 1 joule of work done per second. It is an important concept in physics and engineering to understand how quickly work is being done or how quickly energy is being transferred.

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• 16.

### _________________________ is a quantity that measures how much a machine multiplies force or distance

Explanation
The term "mechanical advantage" refers to a quantity that measures how much a machine multiplies force or distance. It is a concept used to analyze and compare the effectiveness of different machines in terms of their ability to amplify force or increase the distance over which that force can be applied. The mechanical advantage can be calculated by dividing the output force of a machine by the input force applied to it.

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• 17.

### Power is calculated by dividing work by _______________________

time
Time
TIME
Explanation
Power is calculated by dividing work by time. In physics, power is the rate at which work is done or energy is transferred. It is measured in units of watts (W) and is calculated by dividing the amount of work done by the time taken to do it. Therefore, the correct answer is time, Time, or TIME.

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• 18.

### Horsepower is the common unit of power in rating engines.   However, the official SI unit of power is the _________________

watt
Watt
WATT
Explanation
The official SI unit of power is the watt. It is named after James Watt, the Scottish engineer who made significant contributions to the development of the steam engine. The watt is defined as one joule per second and is used to measure the rate at which work is done or energy is transferred. It is a more standardized and internationally recognized unit compared to horsepower, which is commonly used in the automotive and engineering industries.

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• 19.

### A __________________________ is defined as a machine made up of more than one simple machine

compound machine
Compound Machine
COMPOUND MACHINE
Explanation
A compound machine is a machine that is made up of more than one simple machine. It combines two or more simple machines to perform a specific task or function. Simple machines include levers, pulleys, inclined planes, wedges, screws, and wheels and axles. By combining these simple machines, a compound machine can increase mechanical advantage and make tasks easier to perform.

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• 20.

### A(n) ____________________ is an inclined plane wrapped around a cylinder

screw
Screw
SCREW
Explanation
A screw is an inclined plane wrapped around a cylinder. It is a simple machine that is used to fasten objects together or to lift heavy loads. The inclined plane, in the form of a spiral thread, allows the screw to move through a solid material with less force. By turning the screw, the inclined plane moves the load along the thread and creates a mechanical advantage, making it easier to perform tasks such as drilling, tightening, or holding objects in place.

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• 21.

### _______________________ can be defined as the ability to do work

Energy
energy
ENERGY
Explanation
Energy can be defined as the ability to do work. It is the capacity of a system to perform tasks or exert force on an object to cause it to move or change. Energy exists in various forms such as kinetic energy, potential energy, thermal energy, and electromagnetic energy. It is a fundamental concept in physics and is essential for all physical processes and phenomena in the universe.

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• 22.

### ___________________ is the stored energy resulting from the relative positions of objects in a system

potential energy
Potential Energy
POTENTIAL ENERGY
Explanation
Potential energy is the stored energy resulting from the relative positions of objects in a system. It is a form of energy that an object possesses due to its position or condition. This energy can be converted into other forms, such as kinetic energy, when the object's position changes. The three variations of the answer provided are all correct, as they all refer to the same concept of potential energy.

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• 23.

### _____________________ is the energy of a moving object due to its motion

Kinetic Energy
kinetic energy
KINETIC ENERGY
Explanation
The given correct answer for this question is "Kinetic Energy". Kinetic energy is the energy possessed by a moving object due to its motion. It depends on the mass and velocity of the object. As an object increases its speed or mass, its kinetic energy also increases. Kinetic energy is a scalar quantity and is measured in joules (J).

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• 24.

### The sum of all the kinetic and potential energy of a large scale objects in a system is called ______________________

mechanical energy
Mechanical Energy
MECHANICAL ENERGY
Explanation
The sum of all the kinetic and potential energy of a large scale objects in a system is called mechanical energy.

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• 25.

### Energy that lies at the level of atoms and does not effect motion on a large scale is sometimes called ________________ energy

non mechanical
Non Mechanical
NON MECHANICAL
Explanation
The energy that lies at the level of atoms and does not affect motion on a large scale is referred to as non-mechanical energy. This type of energy is not related to the movement or position of objects but rather to the internal structure and interactions of atoms and molecules. It includes forms of energy such as thermal energy, chemical energy, and nuclear energy.

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• 26.

### The source of energy when dynamite explodes is __________________ energy

chemical
Chemical
CHEMICAL
Explanation
When dynamite explodes, the source of energy is chemical energy. This is because dynamite is a type of explosive material that contains chemicals, such as nitroglycerin. When the dynamite is ignited, a chemical reaction occurs, releasing a large amount of energy in the form of heat, light, and sound. This energy is derived from the breaking and rearrangement of chemical bonds within the explosive material, making it a prime example of chemical energy conversion.

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• 27.

### The process that transforms light energy into chemical energy in plants is called_____________________

photosynthesis
PHOTOSYNTHESIS
photosynthesis
Explanation
Photosynthesis is the process in which plants convert light energy into chemical energy. During this process, plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. The chlorophyll in plant cells captures the energy from sunlight, which is then used to convert carbon dioxide and water into glucose. This glucose is stored as chemical energy in the plant, which is essential for its growth and survival. Therefore, the correct answer is photosynthesis.

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• 28.

### The source of the suns energy is _____________________________

nuclear fusion
Nuclear Fusion
NUCLEAR FUSION
Explanation
The correct answer is nuclear fusion. Nuclear fusion is the process by which the sun produces energy. It involves the fusion of hydrogen atoms to form helium, releasing a tremendous amount of energy in the process. This process occurs in the sun's core, where the temperature and pressure are extremely high. Through nuclear fusion, the sun is able to generate the heat and light that sustains life on Earth.

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