Including force in free body diagram

[luca131]

Question
The number of forces acting on a car parked on a hill(with parking brakes engaged) is
Answers
1,2,3,4




When i drew the free body diagram, i got 4 but I am not sure if i should include a force

 

[cristo]

Which four forces did you get? Which one don't you tihnk you should include?

 

[luca131]

i got Mg(weight),friction,normal force, and do i include force or there isn't one in this problem

 

[cristo]

Your three forces are correct. I'm not sure what you mean by the fourth force. The car is at rest remember!

 

[luca131]

o yea thank you