Just think…. Could you lift your science teacher in the air?
Keep Thinking….. (This means you don’t have to write this!!) Building a house Lifting a car Building the pyramids Handicap ramps Paper cutters Wheels on a car What do all of these have in common? They are use simple machines!
Important Definitions Machine- device for doing work Complex machines have motors, simple machines do not Effort- the amount of force applied to a machine Effort is measured in Newtons (N)
Types of Simple Machines Lever Pulley Wheel and axle Inclined plane Wedge Screw
Just Read… Simple machines have been used for thousands of years. They were even used to help build the pyramids!
Levers The most simple and most common simple machine.
Can be an actual wheel and axle OR a bar that rotates around an axis Examples include: Steering wheel A wrench turning a bolt (see levers and pulleys book page 7) Windlass (crank used to raise a bucket, see page 8) Handle of a faucet (page 8)