2.A man drags a 100 kg crate up the ramp of a truck. The ramp is inclined at 20° and the
man pulls at an angle of 30° above the ramp. The coefficient of friction between the crate
and the ramp is 0.2.
a) What is the normal force on the crate in terms of the applied force, F? (Hint: The
normal force does not just balance the perpendicular component of gravity)
b) What is the minimum force the man would have to apply to pull the crate up the ramp
(Hint: minimum force would be the force required to pull the crate up the ramp at
constant velocity)
