A car of mass M is parked on a hill (incline) which makes an angle of 30 degrees with the horizontal. Which of the following is true about the static friction force on the car?
A) fs = µsMgCos(30), because it forms an action/reaction pair with the
normal force
B) fs = MgSin(30), because it forms an action/reaction pair with the
component of weight parallel to the hill
C) fs = µsMgCos(30), because of Newton’s first or second law
D) fs = MgSin(30), because of Newton’s first or second law
