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## Homework Statement

A hydraulic brake system is shown. The

area of the piston in the master cylinder is

6.41 cm2, and the area of the piston in the

brake cylinder is 1.69 cm2. The coefficient of

kinetic friction between the brake shoe and

the wheel drum is 0.449.

How large is the frictional force between the

brake shoe and the wheel drum when a force

of 44 N is exerted on the pedal?

Answer in units of N

## Homework Equations

[itex]\frac{F1}{A1}[/itex] = [itex]\frac{F2}{A2}\frac{}{}[/itex]

A1 = 6.41 cm[itex]^{2}[/itex]

A2 = 1.69 cm[itex]^{2}[/itex]

F = 44 N

μ = 0.449

F = μF[itex]_{n}[/itex]

## The Attempt at a Solution

I don't know how to relate coefficient to this problem. Would you give me some hint please?