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Question	Answer
When does an object have gravitational potential energy?	When it's held above the ground. GPE=mgh
Why doesn't a bouncing ball return to its original height?	It converts gravitational potential energy to kinetic energy and back to gravitational potential energy. It doesn't return to its original height because energy is transferred.
When terminal speed is reached what can it be shown as?	Change in GPE=work done against friction. When sky covers reach terminal speed their kinetic energy has maximum value and remains constant. The gravitational potential energy is lost as they fall is used to do work against friction air resistance.
What is the formula for the loss of the gravitational potential energy?	Loss of gravitational potential energy = gain in kinetic energy. Roller coaster user uses a motor to haul a train up in the air, riders at the top of roller coaster have lots of gravitational potential energy.
Ignoring friction as the train falls:	MGM=1/2mv2. H=mv2/2mg=v2/2g. So this is independent of the mass of the falling object.
GPE at the top = KE at the bottom + energy transfered to heat amd sound due to friction. What does this formula show?	Each peak is lower than the one before because some energy is transferred to heat and sound due to friction.

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	Created by fahimarehman04 about 11 years ago