Homework Help: college physics

Posted by coco on Thursday, February 25, 2010 at 8:52am.

Suppose that the coefficient of friction between your feet and the floor, while wearing socks, is 0.250. Knowing this, you decide to get a running start and then slide across the floor. If your speed is 3.00 m/s when you start to slide, what distance, d, will you slide before stopping?

college physics - drwls, Thursday, February 25, 2010 at 9:15am
(initial kinetic energy) = (work done against friction)

(1/2) M V^2 = F * d

F is the friction force, which in this case is 0.25 M g. The 0.25 factor is the coefficient of kinetic friction.

Solve for the distance d. M cancels out.

d = (1/2) V^2/(0.25 g) = 2 V^2/g

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