1. SIMPLE MACHINES http://www.flixxy.com/best-rube-goldberg-machine.htm Sv0002tares$iddle Schoolciencer. 8006-2007uarter 4imple Machinesideos (1) Video Clips:

2. MACHINES Work is …………………….…… What is a machine?........ Why use machines?.........

5. machines make work we do easier

7. TYPES OF WORK A.INPUT work that goes into the machine needs effort force

8. B. OUTPUT Work done by the machine Resistance Force

9. Machines do not increase work output “ Work output is never greater than work input”

12. What is Mechanical Advantage? Number of times a machine multiplies the effort force Tells how much force is gained by using machine

13. Mechanical Advantage = Output Force Input Force Examples: Inclined Plane: M.A. = Load Effort = 5N/0.2N = 25 Pulley: M.A. = Load Effort = 6.5N/1.5N = 4

19. First Class Levers An example of this type is a seesaw.

20. Second Class Lever The difference from the first class lever is that the fulcrum is on the end, instead of in the middle.

21. Third Class Lever The load is the fish; the handle end is the fulcrum.

28. INCLINED PLANE

33. WEDGES - A wedge is a simple machine shaped like an inclined plane . - It is like a portable inclined plane .

38. WHEEL AND AXLE - made up of two circular objects of different sizes Smaller Object (axle) Larger Object (wheel)