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Simple Machines. Wheel and axle Pulley Lever Inclined plane Wedge Screw.

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Presentation on theme: "Simple Machines. Wheel and axle Pulley Lever Inclined plane Wedge Screw."— Presentation transcript:

1 Simple Machines

2 Wheel and axle Pulley Lever Inclined plane Wedge Screw

3 Work Work is the transfer of energy from one system to another Mechanical work is the product of the magnitude of force in the direction of displacement and the distance through which a body moves Displacement

4 Work Work indicates that a force is exerted and is moving something Simple machines make work easier Microsoft Office Clipart © iStockphoto

5 Wheel and Axle Two connected circular objects of different diameters Microsoft Office Clipart

6 Special Wheel and Axle Gear –Wheel with teeth –Teeth of one gear push against teeth of another gear Microsoft Office Clipart

7 Pulley A wheel (and axle) with a rope running over it Microsoft Office Clipart

8 Pulley A pulley can change the direction of force Multiple pulleys in combination can reduce the effort force to move an object 10 lb 80 lb 10 lb

9 Lever A bar that is free to pivot around a fixed point Microsoft Office Clipart

10 Lever Three components –Resistance Force –Effort Force –Fulcrum Resistance Effort Fulcrum

11 Lever Three types –First Class Fulcrum between effort and resistance forces Effort and resistance forces in same direction Effort Resistance

12 Lever Three types –Second Class Resistance force between fulcrum and effort force Effort and resistance forces in opposing directions Resistance Effort

13 Lever Three types –Third Class Effort force between fulcrum and resistance force Effort and resistance forces in opposing directions Resistance Effort

14 Inclined Plane Slanted surface used to raise an object © iStockphoto Microsoft Office Clipart

15 Specialized Inclined Planes Wedge Screw Images from Microsoft Office Clipart

16 Wedge Inclined plane that moves A triangle shape with a sharp point Can split, cut, tighten, or hold things together Microsoft Office Clipart

17 Screw Inclined plane wrapped around a shaft Used to fasten things together or move things Corkscrew conveyor Worm gear Parking garage ramp © iStockphoto

18 References Microsoft, Inc. (2008). Clip art. Retrieved from microsoft.com/en-us/clipart/default.aspx Wikipedia. Retrieved from iStockphoto. Retrieved from


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