1. Simple Machines How to create Mechanical Advantage?By
Mr. Yersak

2. Objectives Students should be able to:
Calculate the efficiencies of basic power systems
Calculate force multiplication ratios for simple power systems
Create solutions to technological problems by using safe and appropriate tools and techniques associated with power systems. (LEGO Fast Car/ Battle Bot Competition)

3. What are Simple Machines?

4. Simple Machines Levers Pulleys Wheels and Axles Inclined Planes Screws
Wedges
Gears
Devices that create Mechanical Advantage
Mechanical Advantage:
The extent at which a machine makes work easier

5. Levers Definition: Fulcrum: 1st Class Lever: 2nd Class Lever:
Effort
Resistance
Definition:
A rigid bar that rotates (turns) around one fixed point.
Fulcrum:
Fixed Point
Fulcrum
1st Class Lever:
Resistance
Effort
Fulcrum
2nd Class Lever:
Resistance
Fulcrum
Effort
3rd Class Lever:

6. Pulleys Definition: Fixed Pulley: Moveable Pulley:
Changes the direction of force
Definition:
Solid discs with a groove that rotate around a center axis.
Effort
Moveable Pulley:
Force directions stay constant
Effort

7. Wheels and Axle Definition:
A wheel is a lever arm fixed to a shaft called an axle.
Effort
Resistance

8. Inclined Planes Definition: A sloped flat surface with a fixed plane
Resistance
Definition:
A sloped flat surface with a fixed plane
Effort

9. Screws Definition: A long inclined plane wrapped around a shaft Effort
Resistance

10. Wedges Definition: Consists of two inclined planes placed back to back
Effort
Resistance
Definition:
Consists of two inclined planes placed back to back

11. Gears
Definition:
A metal wheel with small notches, or teeth, cut into its rim
Resistance
Effort