Identify the simple machine at the base of a light bulb.
Screw
Identify the simple machine exemplified by a door hinge.
Lever
Identify the simple machine exemplified by a crane.
Pulley
Identify the simple machine approximated by stairs
Inclined Plane
Identify the simple machine exemplified by a doorknob.
Wheel and Axle
Identify the simple machine exemplified by a pushpin.
Lever