Physics Friction Force problem

Question

A 5000 kg truck is parked on a 7.0∘ slope. How big is the friction force on the truck?

Answer 1

The gravitational force on the truck is mg sin(θ).

To stop the parked truck from sliding, the static frictional force must be equal in magnitude.

Plug in m = 5000 kg, g = 9.8 m/s² and θ = 7° to get

(5000)(9.8) sin(7°) = 5971.7 N

Answer (rounded to 2 significant figures)

The frictional force on the truck is 6.0 × 10³ N