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Physics 93 Online
nuclearbxmb:

Which two factors does the power of a machine depend on? A.) work and distance B.)force and distance C.)work and time D.)time and distance

Shadow:

What do you think the answer is?

Shadow:

@nuclearbxmb Are you there?

Shadow:

\[Work = Force \times Distance\] \[Power = \frac{ Work }{ Times }\] Even if you don't know the formula for power, you can use the process of elimination. A is redundant since work already consists of a force, exerted over some distance. B talks about force and distance, which constitutes work, not power. D is time and distance, which relates to things like speed and velocity. The best way to think of power is the rate at which work is done, thus work over time. Work is essentially (as I said earlier) a force exerted over a distance.

Shadow:

This stuff is cool, because people can have the same work done, but not the same power. Example: Person A and Person B walk a distance of 10m. They both did the same amount of work (exerting a force against the ground in order to walk, action-reaction pair). But say, person A got there in 50seconds whilst person B got there in 60 seconds. Whilst they did the same work, person A used more power (as they did the same work but in a shorter period of time).

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