- #1

gijungkim

- 50

- 2

## Homework Statement

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The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and Theta= 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?

## Homework Equations

Fx = Fcos(theta)

Ff = Fn * Uk (Friction equation)

F=ma

Fn = mg

## The Attempt at a Solution

I did it by myself and got 0.234, but the answer says it's 0.28. Can you explain this to me?

My work:

a = F / m

a =( Fcos(35) - Fn * Uk ) / m= 0

Fcos(35) / Fn = Uk

14*cos(35) / (5 * 9.8) = 0.234 = Uk

I don't know where I did wrong