Work, Power, and Machines

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Presentation transcript:

Work, Power, and Machines Intro to Physics

Work and Power Work Force x distance In direction of motion N m joules (J) What is the work done by a weightlifter lifts a 1500 N barbell Over his head to a height of 2.0 m?

Work and Power Power Your Power? Rate watt (W) Horsepower Ex. 1hp = 746 W Ex. P.415 #2 Your Power?

Work and Machines Machine Work in always more than work out Change force Size, direction, distance acts Work in always more than work out

Mechanical advantage and efficiency X increases input force Actual mechanical advantage Output/input Ideal Mechanical Advantage Input distance/output distance Example P. 425

Simple machines Lever Fulcrum IMA First Class Input arm/output arm Fulcrum between input and output forces

Simple Machines Second Class Third Class Output between input and fulcrum Third Class Input between output and fulcrum

Simple Machines Wheel and Axle Inclined Plane IMA = radius input/radius output Inclined Plane IMA = distance traveled/height raised

Simple Machines Wedge Screw threads

Simple Machines Pulleys Compound Machines IMA = # rope sections supporting load Fixed Moveable System Compound Machines

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