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PLEASE HELP QUICK! Why does thermal energy increase on a roller coaster? Especially when it goes up the second hill?

PLEASE HELP QUICK! Why does thermal energy increase on a roller coaster? Especially when it goes up the second hill? class=

Answer :

as friction does negative work, the mechanical energy decreases. The work done by friction transforms mechanical energy into heat, a non-mechanical form of energy. As a result, the temperature of the track and the wheels increase.

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