Work, Energy & Power

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Question 1

What is the unit of work in the International System of Units (SI)?

  • Watt

  • Newton

  • Joule

  • Meter

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Question 2

If an object is lifted vertically against gravity, the work done on the object is:

  • Zero

  • Positive

  • Negative

  • Cannot be determined

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Question 3

The rate at which work is done is called:

  • Energy

  • Velocity

  • Power

  • Force

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Question 4

Which of the following is an example of potential energy?

  • A moving car

  • A stretched spring

  • A rotating fan

  • A falling stone

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Question 5

If a force is applied to an object but the object does not move, how much work is done?

  • Zero work is done

  • The work done is equal to the force applied

  • The work done is equal to the distance moved

  • The work done is positive

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Question 6

When a ball is thrown upwards, what happens to its kinetic energy as it rises?

  • It increases

  • It decreases

  • It remains constant

  • It changes into potential energy

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Question 7

Which of the following increases when a person does more work in less time?

  • The force applied

  • The energy used

  • The power output

  • The velocity of the object

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Question 8

A person lifts a box vertically with a constant force. Which of the following statements is true?

  • The work done by the person is negative

  • The force and displacement are in opposite directions

  • The work done is equal to zero

  • The work done is positive

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Question 9

A person exerts a force to push a box across the floor, but the box does not move. Which of the following is true about the work done?

  • Positive work is done

  • Negative work is done

  • No work is done

  • The work done is equal to the force exerted

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Question 10

What happens to the total mechanical energy of an object in a frictionless environment?

  • It remains constant

  • It decreases over time

  • It increases over time

  • It depends on the object's speed

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Tags:
Physics

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