Simple Machines.

Presentation on theme: "Simple Machines."— Presentation transcript:

Simple Machines

Simple Machines Wheel and axle Pulley Lever Inclined plane Wedge Screw

Work Work is the transfer of energy from one system to another
Presentation Name Course Name Unit # – Lesson #.# – Lesson Name 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 This formula is from the PLTW Engineering Formula Sheet. Displacement

Work Work indicates that a force is exerted and is moving something
Presentation Name Course Name Unit # – Lesson #.# – Lesson Name Work Work indicates that a force is exerted and is moving something Simple machines make work easier This formula is from the PLTW Engineering Formula Sheet. Microsoft Office Clipart Microsoft Office Clipart Microsoft Office Clipart © iStockphoto

Wheel and Axle Two connected circular objects of different diameters
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Special Wheel and Axle Gear Wheel with teeth
Teeth of one gear push against teeth of another gear Microsoft Office Clipart Microsoft Office Clipart Microsoft Office Clipart Microsoft Office Clipart Microsoft Office Clipart

Pulley A wheel (and axle) with a rope running over it
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Pulley A pulley can change the direction of force
10 lb 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

Lever A bar that is free to pivot around a fixed point
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Lever Three components Resistance Force Effort Force Fulcrum Effort

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

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

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

Inclined Plane Slanted surface used to raise an object

Specialized Inclined Planes
Wedge Screw Images from Microsoft Office Clipart

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

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