Work and Power and Conservation of Energy Quiz

The work done in accelerating an object along a frictionless horizontal surface is equal to the change in its ______________________________.

A motor used 120 watts of power to raise a 10 Newton object in 5.0 seconds. Through what vertical distance was the object raised?

The diagram below shows points A, B, and C at Earth’s surface. As a mass is moved from point A to B, 500J of work are done against gravity. What is the amount of work done against gravity as an identical mass is moved from point A to C?

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A 40 kg toy car is the top of a 0.3 m hill going 2 m/s. How much mechanical energy does the car have at the top of the hill?

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A car is at the top of a 43m hill driving at a speed of 5 m/s. How fast is the car moving at the bottom of the hill? (Ignore friction)

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Using conservation of energy, describe the potential, kinetic, and total mechanical energy at positions 1, 2, and 3.

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