Becky W.

asked • 02/12/21

How do you find Work using only force?


Currently, in high school Physics, been working on this one for about an hour now:


"A football player pushes a tackling dummy (mass = 70 kg) for 72 seconds. If he pushes with a

force of 82 N, what is his average power output?"


I know how to do everything but I'm stuck at a stand-still because I can't figure out how to get work without distance. My question is given the information I have, how do I solve this?


I've been using w= f x d for work and p= w/t for power.

Inactive Tutor

Hi Becky, even I am a bit confused with the problem. Is that the exact wording of the problem? Does it say he pushes with a "force of 82 N" or does it say with a "net force of 82N" ? If it is a "net force" then you'd be know the initial velocity and could calculate the final velocity, and from this, could determine the average velocity of the mass. With this, you could calculate the power as the average power given a constant force is equal to Force * velocity.
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02/13/21

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