- #1

Lo.Lee.Ta.

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shown in figure below. The force F is 280 N. The coefficient of kinetic friction between the crate and the floor is 0.170. What is the acceleration of the crate?"

______box---^=Pulley__

Okay, this is a weird drawing of the situation. Just a box on a flat surface.

It's attached by a string to a pulley and the other end of the string is anchored to a

cone (^).

So I thought the solution is just this:

εF(y) = ma(y)

-w + N = ma(y)

-392 + N = (40)(0)

N= 392N

εF(x) = ma(x)

-f + F = ma(x)

[mu(k)](N) + 280 = (40)(a)

(.17)(-392) + 280 = (40)(a)

a= 5.33m/s^2

BUT, this is not the right answer on my test!

The right answer is 1.83m/s^2.

How do you get that answer?

Thank you so much! :D