A) A bully is pushing a boy against a locker as shown with a force of 500N. The angle between his arms and the ground is 40°. Draw a free-body
diagram of the boy and then find the normal force between the boy and the
wall.
b) A 200 kg block, on a VERY rough surface, is being pulled pushed by two people, one on
each end. The first person is pulling with a force of 20 N at an angle of 40° above the
ground, while the other person is pushing with a 30 N force at an angle of 50° above the
ground. Find the normal force on the block.
c) In terms of the normal force, explain what is necessary for an object to physically "lift"
off of the ground.