1. A device that does some kind of work for you
Simple Machines
A device that does some kind of work for you

2. Definitions Motion – movement as a result of some force
Force – A push or pull applied to an object
Work – The application of force to cause an object to move in the direction of the force

3. Definitions continued:
Load – An external force on an object
Effort – The force that you apply to the machine to move the load or overcome a resistance
Potential Energy – Energy at rest.
Kinetic Energy – Energy in motion.

4. Lever – parts of a lever
Fulcrum – the point around which a lever turns or pivots
Effort
Load
*There are three classes of levers

5. Class one Lever The fulcrum is between the effort and the load.
Examples
See-saw
Hammer’s Claw
Scissors
Nail Clippers
Pliers
Effort
Load
Fulcrum

6. Class Two Lever
The fulcrum is at one end, and the effort is at the other. The load falls in between them.
Examples:
Stapler
Bottle Opener
Wheelbarrow
Nut Cracker
Effort
Load
Fulcrum

7. Class Three Lever
The fulcrum is at one end on top the effort is next to the fulcrum and the load is on the end.
Examples
Fishing pole
Your arm
Hockey Stick
Effort
Load
Fulcrum

8. Wheel and Axle
A wheel attached to a smaller wheel or shaft to increase force or speed
Example:
Bicycle wheel
Grindstone
Steering wheel
Gears

9. Inclined Plane
A plane set at an angle to a horizontal surface forming a ramp.
Example:
Ramp
A Roller coaster
Stairs

10. Inclined Plane

11. Wedge
Made up of two inclined planes that form a point. It is used to push an object apart.
Example:
Axe
knife
Doorstop

12. Screw Machine An inclined plane that is wrapped around a pole Example
Drill bits
Bottle cap
C - clamps

13. Pulley Uses grooved wheel and a rope to raise, lower, or move a load
Example
Crane
Flag pole
Window blinds
Garage door opener

14. Pulley

15. Pulley