___ 21 A double inclined plane that is sharpened to an end it adds more force to the effort as it goes through a longer distance.
___ 22 A device which has fulcrum or pivot point the effort end where force is applied and the resistant end where the load is located.
___ 23 A modified wheel and axle it is a special type of wheel that has a rope sliding on the groove of the wheel the groove prevents the rope from sliding.
___ 24 It has the same apperance with a pulley but it has a wheel that is fixed to the axle like in the steering wheel of a car.
___ 25 The screw is a form of inclined plane that is wrapped around a central shaft.
A screw
B lever
C pulley wedge
D inclined plane
​