1. Simple Machines

2. Simple Machine A device that does work with only one movement
Inclined plane, pulley, or lever

3. Levers Fulcrum-the pivot point
Effort arm-the part of the lever on which the effort force is applied
Resistance arm-the part of the lever that exerts the resistance force

4. MA of Levers
length of effort arm divided by the length of the resistance arm

5. 3 Classes of Levers First class-teeter totter Second class-door
Third class-broom
Third class always less than one
Used to change the direction

6. Ideal Mechanical Advantage of a Lever
IMA is the length of the input arm divided by the length of the output arm

7. Pulleys Pulley is a grooved wheel with a rope running along the groove
Fixed pulley used to change direction of force and MA of 1
Movable pulleys one end is fixed and the pulley(s) are free to move
Block & tackle- combination of pulleys

8. MA of pulleys Count the support rope
Count the effort rope only if it pulls up

9. Wheel and Axle
A simple machine consisting of two wheels of different sizes that rotate together
Screw driver, ice cream freezer

10. MA of Wheel & Axle
radius of wheel divided by radius of the axle

11. Inclined Plane
A sloping surface used to raise objects

12. MA of Inclined Planes
Length of slope divided by the height of slope

13. Screw & Wedge screw is an inclined plane wrapped around a post
Wedge is an inclined plane with one or two sloping sides

14. Compound Machines Combinations of two or more simple machines
Axe- wedge and lever

15. The End!!!