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## Homework Statement

A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force

*s*= 0.43 and μ

*k*= 0.24.

(a) Determine the magnitude of the frictional force acting on the block if the magnitude of

## Homework Equations

F_friction = Mu*F_normal

## The Attempt at a Solution

I really need help with this one, because I don't understand why I get a wrong answer.

Firstly, the net force in the y direction is 0. So F_g = P + F_N.

Then F_N = F_g - P = 2.5 * 9.8 - 8 = 16.5 N

Then since (I believe) the block is stationary, we use μ

*s*= 0.43, and so F_f = 0.43 * 16.5 =7.095.

Satisfied with my answer, I put this in the webassign, but it won't accept this as the correct answer. Where did I go wrong?

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