Physics
Grade-9
Easy
Question
Energy can be added to a system by ____.
- Work
- Heat
- Both a and b
- None
Hint:
Transferring energy by heat is the only way to add energy to or remove energy from a system. Doing compression work is the only way to add energy to or remove energy from a system. Doing expansion work is the only way to add energy to or remove energy from a system.
The correct answer is: Both a and b
Energy can be added to a system either by doing work W on it or by adding heat Q to it. Energy transfer by work requires a force to act through some distance.
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