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Question by Stela: Physics homework help? Enegy conversions.?
Please don’t say do your own homework. I have no clue how tro do it. Can you maybe explain how energy conversions happen. We have a table we have to fill in. one column says “energy input” the other says “energy output” and then we have the situations given. For example: ” a sprinter running a 100 meter race” we have to say what the energ input is and what the energy output is like how it was converted. Theres also “a cyclict free wheeling down a hill”, ” a growing plant”, “An electric motor.” and others.
ANy help will be greatly appreciated, Thanks.
Best answer:
Answer by adbhatts My best guess would be to look at each situation and determine what force is acting upon the system to bring about change. For example, the runner: the sprinter has to push off of the ground to propel his/her body forward. The force of the sprinter’s legs pushes him/her forward, causing the sprinter to move forward, which would be the energy output.
The cyclist has the force of gravity acting upon him, pulling him down the grade. Input could be gravity, output could be movement down the hill.
The plant is growing new cells and pushing above the soil, and the energy output is simply growth upward, against gravity pulling it down.
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