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Questions and Answers
When a block slides on a rough surface, why does it become warm?
When a block slides on a rough surface, why does it become warm?
- Due to the decrease in friction
- Due to the increase in mechanical energy and decrease in internal energy
- Due to the loss of mechanical energy and increase in internal energy (correct)
- Due to the transfer of mechanical energy to the surroundings
What happens when a hot body is kept in contact with a cold body?
What happens when a hot body is kept in contact with a cold body?
- The hot body absorbs more heat from the cold body
- Both bodies maintain their temperatures
- The cold body warms up and the hot body cools down (correct)
- The cold body absorbs energy from the surroundings
What happens when two vehicles collide during an accident?
What happens when two vehicles collide during an accident?
- They become very hot due to the loss of mechanical energy (correct)
- They absorb mechanical energy from the surroundings
- Friction between them decreases their temperature
- They remain at their initial temperature
Why does an aeroplane catch fire when it crashes?
Why does an aeroplane catch fire when it crashes?
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What happens to the internal energy of a hot body when it is placed in contact with a cold body?
What happens to the internal energy of a hot body when it is placed in contact with a cold body?
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