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## Homework Statement

A 3812.0 kg truck is parked on a 18.1° slope. What is the friction force on the truck?

## Homework Equations

## The Attempt at a Solution

So i set up a triangle with and then used:

weight of truck= (9.8 m/s^2 *3812 Kg) = 37367.6 N

sin(18.1) = (37367.6 N) /(-Ff)

Ff = -120246 N

Could someone explain why this is wrong.. im thinking maybe i set up my triangle incorrectly, but i dont know how else i would draw it.. thanks in advance