A force that opposes motion between two surfaces that are touching

A comparison of the amount of energy before a conversion with the amount of useful energy after a conversion

Perpetual motion is impossible because

Whenever one form of energy is converted into another, some of the original energy is always converted into which type of energy?

On a roller coaster, where is the potential energy the greatest?

When a group of objects move energy only to each other, you have a(n)

The total amount of ______________________________ in a closed system is always the same.

shape of a car that helps it be more energy efficient

rule that states that energy cannot be created or destroyed

When there is friction on a roller coaster, some of the potential energy is not converted into

Whenever one form of energy is converted into another, some of the original energy is always converted into which type of energy?

When a roller coaster moves, what helps to overcome friction?

When energy is converted, what type of energy is wasted?

What is a perpetual motion machine?

this is a comparison of the amount of energy before a conversion with the amount after

this is reduced with a better shaped car

this helps cars use energy in a more useful way

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