Energy, Work, and Power

A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s. What useful power does he develop in doing this?

• 800 W

• 700W

• 4000W

• 5000W

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At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A

• B

• C

• D

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Groot rescues Rocket from the bottom of a deep pit. Groot expends 1000 J of energy lifting Rocket who has a mass of 50 kg out of the pit. How deep is the pit?

• 0.5 m

• 2 m

• 4 m

• 10 m

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How do you calculate power?

• P = W/t

• P = E/t

• P = w * t

• P = bbq/chicken

The SI unit of work is?

• Joules

• Watts

• Newtons

• meters

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Gravitational potential energy depends on the ________ and ________ of the object. 

• Height and mass

• Friction and movement

• Mass and Movement

• Height and Friction 

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Why does the total amount of mechanical energy stay constant in a system?

• energy is not created or destroyed

• energy leaves

• energy enters

• energy is not converted from one form into another

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What is the formula for calculating the total amount of mechanical energy?

• ME = KE + PE

• KE = ME + PE

• PE = KE + ME

• ME = 1/2 mv²

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Which situation is work not done?

• lifting a 20 pound box off the floor

• holding a 20 pound box above the floor

• sliding a 20 pound box across the floor

• sliding a 20 pound box up an inclined plane

A battery converts what type of energy to another?

• sound to kinetic

• light to heat

• mechanical to electrical

• chemical to electrical