A drawer slides horizontally into a cabinet until its back panel presses against a rubber stop fixed to the back wall of the cabinet.
Which statement describes the normal contact force that the drawer experiences at the rubber stop?
It is a push by the drawer on the rubber stop, at right angles to the touching surfaces.
It is a force by the rubber stop on the drawer, acting along the touching surfaces.
It is a push by the rubber stop on the drawer, acting vertically upwards.
It is a push by the rubber stop on the drawer, at right angles to the touching surfaces.