Simple Machines
By: Kelsey
A lever is a simple machine that consists of a bar that pivots at a fixed point,
called a fulcrum.
Levers are used to put force on a load.
Second Class Lever
Input Force
First Class Lever
Output Force
Load
Input Force
Fulcrum
Third Class Lever
Output Force
Output Force
Fulcrum
Input Force
Load
Fulcrum
An inclined plane is a simple machine that is a straight, slanted surface.
Using an inclined plane uses less force to move a load than without one.
Wedge
A wedge is a double inclined plane that moves.
It applies output force greater than your input force.
A screw is an inclined plane that is wrapped in a spiral.
When a screw is rotated, a small force is applied along the inclined
plane of the screw.
and
A
x
l
e
A wheel an axle is a simple machine consisting of two circular objects of different sizes.
When a small input force is applied to the wheel, it rotates through a circular distance.
Wheel
Axle
Input force
Output force
Pulleys
A pulley is a simple machine consisting of a grooved wheel that holds a rope or cable.
A load is attached to one end of the rope, and an input force is applied to
the other end.
Movable Pulley
Fixed Pulley
Input Force
Input
Force
Output Force
Output Force
Machines
A compound machine is a machine made from two or more simple machines.
zipper
scissors
Each arm of the scissors is a first class lever.
Each sharpened edge of the scissors is a wedge.
Lever
Wedge
Bibliography
All pictures from:
Microsoft Office ClipArt