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Work, Power and Energy: Negative Work Examples

12 Questions

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Work, Power and Energy: Negative Work Examples

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Questions and Answers

What does negative work indicate in the context of classical mechanics?

The force is tending to speed up the object

The direction of the force

The force is balanced

The force is tending to slow the object down (correct)

Which of the following is an example of negative work being done?

Moving a heavy object upwards

Someone pushes you (correct)

Lifting a box on a table

Pushing a car up a hill

What is the relationship between work and change in kinetic energy according to the work-energy theorem?

Work and change in kinetic energy are unrelated

Kinetic energy affects the amount of work done

When work is done on an object, there will be no change in kinetic energy

When work is done on an object, there will be a change in kinetic energy (correct)

What is the unit of energy used for measuring energy?

Joules Signup and view all the answers

In the context of classical mechanics, when does negative work occur?

When the force and motion are in opposite directions Signup and view all the answers

What does the work-energy theorem state?

Work done equals final kinetic energy minus initial kinetic energy Signup and view all the answers

What is the formula for power in the mks system of units?

Power = Work / time Signup and view all the answers

What is the unit of power in the mks system of units?

Watt (W) Signup and view all the answers

How many watts are in a kilowatt?

1000 Signup and view all the answers

In the British system of units, power is measured in:

Horsepower (HP) Signup and view all the answers

If a force of 20 N pushes an object a distance of 5 m, how much work is done?

$40 J$ Signup and view all the answers

If 500 J of work is done in 10 s, what is the power?

$50 W$ Signup and view all the answers