Question

What is the cause of heat generation in the
following situations:
(a) We apply brakes on our fast moving car.
(b) People often jump up and down to feel warmer
in cold weather​

Answer 1

friction

1) when brakes are applied the grooves of the tyre come in contact with road and generate friction it causes release of heat energy

2 ) when we jump our clothes get rub with air molecules and generate friction and release energy in form of heat

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Answer 2

Answer:

When brakes are applied on our fast moving car, the brakes produce heat due to friction. People often jump up and down in cold weather to feel warm because the body produces heat while jumping, this heat keeps them warm. When we apply brakes in a moving car heat produces due to friction.