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## Homework Statement

## Homework Equations

us*Fn = Fs

FNET = ma

Fk = us*Fn

**3. The Attempt at a Solution**

**A**0.42*9.8*4.4 = Fs

**Fs = 18.1104N**

**B**F = ma

**m = 18.1104N/9.8m/s/s**

m = 1.848kg

1.848kg-0.120kg = 1.728kg for the washers to make up for

1.728kg/(0.02kg/washer)

**= ~86 washers**

__C__I'm not sure how to answer this question.

__D__Fk = us*Fn

= 0.34*9.8*4.4

= 14.6608N

FNET = ma

**Ft - Fk**= (4.4+(1.848))*(a)

18.11 - 14.6608 = (4.4+(1.848))*(a)

a = 3.4496/(4.4+1.848)

a = ~0.552m/s/s

I get the right answers for this question, but what I don't understand is that, the force required to overcome static friction is ~18.11N. But the box is not getting the full 18.11N from the bucket, is it? Isn't some of that force used to push the bucket down, and then tension is what ends up needing to be 18.11N? How can the tension be the entire 18.1104N if some of that force is "used" to pull the bucket down?

Sorry if this is a little confusing. Thanks for any help.