Simple Machines (Part 1) CHAPTER 14 – WORK AND SIMPLE MACHINES Simple Machines (Part 1)

Simple Machines a machine that does work with only one movement Inclined plane Lever Wheel and Axle Screw Wedge Pulley

Compound Machine a machine made up of a combination of simple machines inclined lever wheel screw wedge pulley plane and axle

Inclined Plane also called a ramp requires less force than lifting an object the longer the inclined plane, the smaller the force needed to move an object

wedge an inclined plane that moves one or two sloping sides wedges change the direction of the applied effort force example: front teeth

Screw Inclined plane wrapped around a cylinder or post changes the direction of the applied force Friction between the threads and the material holds the screw tightly in place

levers any rigid rod or plank that pivots, or rotates, about a point fulcrum- point about which the lever pivots different classes of levers based on location of the fulcrum (seesaw, wheelbarrow)

wheel and axle two circular objects of different sizes that are attached in such a way they rotate together wheel = larger axle = smaller

pulleys a grooved wheel with a rope or cable wrapped over it fixed pulleys- ex: sail, window blind, flagpole, changes the direction of the force movable pulleys- attaches to the object being lifted and allows you to exert a smaller force

Pulley Systems combination of fixed and movable pulleys mechanical advantage is equal to the number of sections of rope pulling up on the object