# Physical Science Machines And Energy

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| By Cheer24banana
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Quizzes Created: 1 | Total Attempts: 83
Questions: 22 | Attempts: 83

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Physical Science Quiz

Questions and Answers
• 1.

### Speed is the rate at which an object_______

Explanation
Speed is the rate at which an object moves. It refers to how quickly an object changes its position over a certain amount of time. The higher the speed, the faster the object is moving. Speed is a scalar quantity and is typically measured in units such as meters per second (m/s) or kilometers per hour (km/h).

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• 2.

### What is Velocity?

• A.

Spped

• B.

Speed in a given direction

• C.

Speed in a given distance

• D.

Direction in a given speed

Correct Answer
B. Speed in a given direction
Explanation
Velocity is defined as the speed of an object in a given direction. It not only considers the magnitude or numerical value of the speed but also takes into account the specific direction in which the object is moving. This is important because two objects can have the same speed but different velocities if they are moving in different directions. Therefore, velocity provides a more comprehensive understanding of the motion of an object by incorporating both speed and direction.

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• 3.

### The rate of_______in ___________ is Acceleration

Correct Answer
Change, Velocity
Explanation
Acceleration is defined as the rate of change of velocity with respect to time. In this context, "rate of change" refers to the amount of change that occurs over a given time period. Therefore, the correct answer is "Change" because acceleration represents the change in velocity. "Velocity" is the quantity that is changing, and it is the measure of an object's speed and direction.

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• 4.

### All moving objects have________-

• A.

Momentum

• B.

Mass

• C.

Velocity

Correct Answer
A. Momentum
Explanation
Momentum is a property of moving objects that depends on both their mass and velocity. It is a measure of how difficult it is to stop or change the motion of an object. Therefore, all moving objects have momentum regardless of their mass or velocity.

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• 5.

### A force is a________

Correct Answer
Push or pull
Explanation
A force is a push or pull exerted on an object. It can cause an object to move, change its speed or direction, or deform its shape. Pushing is a force that moves an object away from the force, while pulling is a force that moves an object towards the force. These actions are the fundamental ways in which forces are applied and can be observed in various everyday situations.

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• 6.

### The first law of motion is also called.....

Correct Answer
The law of Inertia
Explanation
The first law of motion is also known as the law of inertia. This law states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and direction unless acted upon by an external force. Inertia is the resistance of an object to changes in its motion. Therefore, the law of inertia is an appropriate name for the first law of motion as it describes the tendency of objects to maintain their state of motion.

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• 7.

### The first law of motion states...

• A.

That an object at rest will remain at rest and an object in motion will remain in motion at constant velocity untill acted upon by an unbalenced force.

• B.

Shows how force, mass, and acceleration are related.

• C.

That for every action, there is an equal and opposite reaction.

Correct Answer
A. That an object at rest will remain at rest and an object in motion will remain in motion at constant velocity untill acted upon by an unbalenced force.
Explanation
The first law of motion, also known as the law of inertia, states that an object at rest will remain at rest and an object in motion will remain in motion at a constant velocity until acted upon by an unbalanced force. This means that if there are no external forces acting on an object, it will either stay still or continue moving in a straight line at a constant speed. It also implies that the natural state of an object is to resist changes in its motion, whether that be starting, stopping, or changing direction.

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• 8.

### The second law of motion states......

• A.

That for every action, there is an equal and opposite reaction.

• B.

That an object at rest will remain at rest and an object in motion will remain in motion at constant velocity untill acted upon by an unbalenced force.

• C.

Shows how force, mass, and acceleration are related.

Correct Answer
C. Shows how force, mass, and acceleration are related.
Explanation
The second law of motion states how force, mass, and acceleration are related. According to this law, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In other words, the greater the force applied to an object, the greater its acceleration will be, and the greater the mass of an object, the smaller its acceleration will be for a given force. This relationship between force, mass, and acceleration is described by the equation F = ma, where F represents force, m represents mass, and a represents acceleration.

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• 9.

### The third law of motion states.....

• A.

That an object at rest will remain at rest and an object in motion will remain in motion at constant velocity untill acted upon by an unbalenced force.

• B.

Shows how force, mass, and acceleration are related.

• C.

That for every action, there is an equal and opposite reaction.

Correct Answer
C. That for every action, there is an equal and opposite reaction.
Explanation
The correct answer is that for every action, there is an equal and opposite reaction. This statement is known as Newton's third law of motion. It explains that whenever an object exerts a force on another object, the second object exerts a force of equal magnitude but in the opposite direction on the first object. This law highlights the concept of action-reaction pairs, where forces always occur in pairs and act on different objects. This law is crucial in understanding the interactions between objects and the conservation of momentum in a system.

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• 10.

### Gravity equals.......

• A.

9.8 meters per second squared

• B.

8.8 meters per second squared

• C.

9.8 meters per secong cubed

• D.

1000000000000000000000000000000000000mps

Correct Answer
A. 9.8 meters per second squared
Explanation
Gravity is a force that attracts objects towards each other. The acceleration due to gravity on Earth is approximately 9.8 meters per second squared. This means that for every second an object falls, its velocity increases by 9.8 meters per second. The correct answer states that gravity equals 9.8 meters per second squared, which is the standard value for the acceleration due to gravity on Earth.

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• 11.

### Weight is a measure of the___________

Correct Answer
Force of gravity on an object
Explanation
Weight is a measure of the force of gravity on an object. When an object is subjected to the force of gravity, it experiences a pull towards the center of the Earth. This force is what we refer to as weight. Weight is directly proportional to the mass of an object, meaning that the greater the mass, the greater the force of gravity and therefore the greater the weight. Weight is commonly measured in units such as pounds or kilograms.

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• 12.

### The "Push" or force particles exert over a certain area is called___

Correct Answer
Pressure
Explanation
Pressure is the force applied per unit area. When particles push or exert force over a certain area, it results in pressure. Pressure is a measure of how much force is distributed over a given area. It is commonly used to describe the force exerted by gases or fluids, as well as the force exerted by solids. Therefore, pressure is the correct term to describe the "push" or force particles exert over a certain area.

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• 13.

### Power is the rate at which work is_________

Correct Answer
Done
Explanation
Power is the rate at which work is done. This means that power measures how quickly work is being performed or how fast energy is being transferred or converted. It is a measure of how much work can be done in a given amount of time. In other words, power is the amount of energy expended or work done per unit of time.

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• 14.

• 15.

### An instrumenthat makes work easier is called a______

Correct Answer
Machine
Explanation
A machine is an instrument that is designed to make work easier by utilizing mechanical power or devices. Machines are typically created to perform specific tasks or functions, often using energy sources such as electricity, fuel, or human power. They are used in various industries and sectors to automate processes and increase efficiency.

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• 16.

### The comparison of work output to work input is called the_______

Correct Answer
Efficiency
Explanation
Efficiency is the measurement of how effectively a system or machine converts input work into useful output work. It is calculated by dividing the useful output work by the input work and multiplying by 100 to express it as a percentage. Efficiency is an important concept in various fields, such as engineering and physics, as it helps determine the effectiveness of a system or process in utilizing energy or resources.

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• 17.

### How many types of simple machines are there?

• A.

5

• B.

6

• C.

7

• D.

8

• E.

9

Correct Answer(s)
B. 6
C. 7
Explanation
The question asks about the number of types of simple machines. The answer options are 5, 6, 7, 8, and 9. The correct answer is 6,7. This suggests that there are either 6 or 7 types of simple machines. Without further information, it is unclear which specific number is correct.

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• 18.

### The machines are_____

• A.

The wedge, the screw, the lever, the pulley, the wheel and axle ,and the inclined plane.

• B.

The wheel, the saw, the axle, the simple machine, the lever, the pulley

• C.

The pulley, the wheel and axle, the screw, the lever, the inclined plane, the ax

Correct Answer
A. The wedge, the screw, the lever, the pulley, the wheel and axle ,and the inclined plane.
Explanation
The correct answer includes all the different types of machines mentioned in the question, such as the wedge, the screw, the lever, the pulley, the wheel and axle, and the inclined plane. These are all examples of simple machines that are used to make work easier by changing the direction or magnitude of a force.

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• 19.

### How many forms of enegy are there?

• A.

2

• B.

3

• C.

4

• D.

5

• E.

6

Correct Answer
D. 5
Explanation
There are five forms of energy: mechanical energy, thermal energy, chemical energy, electrical energy, and nuclear energy. Mechanical energy refers to the energy associated with the motion or position of an object. Thermal energy is the energy associated with the temperature of an object. Chemical energy is the energy stored in the bonds between atoms and molecules. Electrical energy is the energy associated with the flow of electric charge. Nuclear energy is the energy stored in the nucleus of an atom.

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• 20.

### Which are the forms of energy?

• A.

Mechanical Energy

• B.

Heat Energy and Chemical Energy

• C.

Electromagnetic Energy

• D.

Nuclear Energy

• E.

All of the above

Correct Answer
E. All of the above
Explanation
All of the above options are forms of energy. Mechanical energy refers to the energy possessed by an object due to its position or motion. Heat energy is the energy transferred between objects due to a difference in temperature. Chemical energy is the energy stored in the bonds of chemical compounds. Electromagnetic energy is the energy carried by electromagnetic waves, such as light and radio waves. Nuclear energy is the energy released during nuclear reactions. Therefore, all of these options represent different forms of energy.

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• 21.

### Kinetic Energy is energy in____________ Potential energy is energy of_____________

Correct Answer
Motion, Position
Explanation
Kinetic energy is the energy possessed by an object due to its motion. It depends on the mass and velocity of the object. On the other hand, potential energy is the energy that is stored in an object due to its position or state. It can be gravitational potential energy, elastic potential energy, or chemical potential energy, among others. Therefore, the correct answer is motion for kinetic energy and position for potential energy.

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• 22.

### The law of conversion states......

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• Current Version
• Nov 14, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 17, 2008
Quiz Created by
Cheer24banana

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