1. Simple Machines
Rube Goldberg Project

2. Simple Machines #1 Inclined Plane Reduces Force Increases Distance
Examples
Wheel Chair Ramp
Loader for truck

3. Simple Machine #2 Wedge #3 Screw Two inclined planes pushed together
Lessens force by increasing distance
#3 Screw
Inclined plane wrapped around a cylinder
Lessens force by increasing distance

4. Simple Machines #4 Lever
Beam or stick that pivots or rotates on a fulcrum
Fulcrum is the stationary part of a lever
Three classes of levers

5. Simple Machines #5 Wheel & Axle #6 Pulley
Wheel attached to a smaller axle in which a force is transferred
#6 Pulley
A rope or string that uses a central wheel to rotate

6. Mechanical Advantage The amount a machine reduces force
Output Force divided by Input Force (Load divided by Effort)
No units

7. How to make things easier
Incline Plane & Wedge
Lengthen the ramp and lower the angle
Screw
Lower the incline (edges closer together)
Lever
More distance from effort to fulcrum than load to fulcrum
Wheel and Axle
Increase the ratio of wheel diameter to axle diameter
Pulley
Add more wheels
You will have to pull more rope but it will be easier

8. Catapult & Rube Goldberg Project
Who was Rube Goldberg?
Cartoonist/Inventor
Term used for making a simple task more complex

10. Passing man (A) slips on banana peel (B) causing him to fall on rake (C). As handle of rake rises it throws horseshoe (D) onto rope (E) which sags, thereby tilting sprinkling can (F). Water (G) saturates mop (H). Pickle terrier (I) thinks it is raining, gets up to run into house and upsets sign (J) throwing it against non-tipping cigar ash receiver (K) which causes it to swing back and forth and swish the mop against window pane, wiping it clean. If man breaks his neck by fall move away before cop arrives.

11. Videos