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A toy car rolls down a ramp, even absence of non-conservative forces, it's
not possible for all of it's potential energy to convert into kinetic energy.
What is moving, within the car-system itself, that is also gaining energy
in order for this part of the car to move? How is this responsible for
consuming some of the mechanical energy?

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Answer:

Hello i hope this helps you! Potential and Kinetic EnergyHold the car at the top of the ramp, and release to demonstrate the two main kinds of energy. Potential energy is placed into the car when it's lifted from the floor, and that energy is released as the car rolls down the ramp.

Explanation:

hope this helps

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