Simple Machines
Published on Apr 12, 2016
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PRESENTATION OUTLINE
Work is the application of force to move a load over a distance
Photo by JD Hancock
Effort is the amount of force required to do work
Photo by istolethetv
Mechanical advantage is the amount a machine makes work easier by reducing the force (effort) required to move a load
Photo by __MaRiNa__
There are six kinds of simple machines
Photo by Leo Reynolds
An incline plane makes moving a load UP easier
Photo by Payton Chung
EX: wheelchair ramp
Photo by DennisTsang
A screw is an incline plane wrapped around a wedge to make a spiral
Photo by CARLISLEHVAC
As the screw rotates it moves up or down; it is used to hold things together
Photo by macrorain (sigberg)
In a 1st class lever the fulcrum is between the effort and the resistance
EX: see saw
Photo by nzgabriel
In a 2nd class lever the resistance (load) is between the effort and the fulcrum
EX: wheelbarrow
Photo by GlennFleishman
In a 3rd class lever the effort is between the resistance and the fulcrum
EX: tennis racket
Photo by NAPARAZZI
A pulley is a chain, rope, or belt wrapped around a wheel
Photo by Elsie esq.
EX: block and tackle
Photo by originalrobart
Compound machines are simple machines acting together to perform work
Photo by freshwater2006
EX: bicycle
Photo by State Library Victoria Collections
