Simple Machines Chapter 6 The perplexity of life

Simple Machines Chapter 6

�“The perplexity of life arises from there being too many interesting things in us to be interested properly in any of them” �-G. K. Chesterton

�Read p. 88 -89

Machine �a device that changes the amount or direction of the force needed for work � 6 main types

Inclined Plane �a simple machine that allows us to raise objects little by little instead of all at once

Screw �A special type of inclined plane that can convert a rotational movement into a vertical movement �A screw is a spiral inclined plane

Wedge �a simple machine made out of two inclined planes placed back to back

Lever �A long board or rod that rotates around a fulcrum �Fulcrum: a sturdy object or surface that the board rotates around � 3 types of levers

First Class Lever �A lever in which the fulcrum is between the force and the load

Second Class Lever �Levers in which the load is between the force and the fulcrum �Increase force, does not change direction

Third Class Lever �A lever in which the force is in the middle of the fulcrum and the load • Multiply distance

What type of lever is this?

Wheels �Friction: the drag when objects move across each other �Rolling wheel: decreases the amount of friction (drag) involved in work

Wheel and Axle �A simple machine made of a wheel firmly attached to a rod (axle) �Force is applied to the wheel

Reverse Wheel and Axle �The force is applied to the axle

Pulley �A wheel in a frame �Can change the direction of the force or the amount of force

4 types of pulleys Changes direction of force Decreases the amount of force Changes the direction & decreases amount of force