In which situations is work being done? (You can pick more than 1)

Hannah leans against her locker, but it doesn't move.

Andy's car rolls down a hill with the engine off.

A wind turbine stands still on a sunny, windless day.

A balloon expands as it is heated by the Sun.

James pedals a stationary exercise cycle that doesn't move.

Question

Valentine

Physics

24 February, 18:51

In which situations is work being done? (You can pick more than 1)

Hannah leans against her locker, but it doesn't move.

Andy's car rolls down a hill with the engine off.

A wind turbine stands still on a sunny, windless day.

A balloon expands as it is heated by the Sun.

James pedals a stationary exercise cycle that doesn't move.

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Answers (1)

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Spencer Powers · Answer 1

A balloon expanding would count as work because it is moving and none of the others are. However, I think that James pedaling also works because at least he is using his leg muscles even though he's not moving. He is working because he is exercising himself and that count as working. I would chose James over all of them.