Simple Machines

By: Ana Lopez

Define: Simple Machine

A simple machine is an unpowered mechanical device

5 Simple Machines

* Pulley* Lever* Gear* Wheel and Axle* Inclined Plane

PulleyRule for mechanical advantage

Input and Output forcesThe Input Force for a pulley is the force exerted on the pulley.The Output Force is the force that results from the force exerted.

Pulley• Real World Example

A real world example of a pulley is curtains in a theater. The curtains are lifted by using a pulley.

Theater Curtains would be hard to lift without using a pulley.

Lever• Rule for mechanical

advantage

• Input and Output Forces– The Input Force of a

Lever the heavier side of the lever.

– The Output Force of a Lever is the lightest side of the lever.

Fulcrum

Input ArmOutput Arm

Output Forces

Lever • Real World Example– A real world example of a

lever is a see saw

– A see saw has an input and output arm and both go up and down like the lever does

– The heavier side of the see saw goes down and the heaviest side of a lever goes down too

Gear• Gear Ratio

– The Gear Ratio is equal to the number of teeth on the input gear divided by the number of teeth on the output gear.

• Input and Output Force– The Output and Input

Force are chosen

Input Force

Output Force

GearReal World Example

A real world example of a gear is a clock

Clocks have internal gears that help them work properly

Wheel and AxleRule For Mechanical Advantage

The mechanical advantage of a wheel and axle is the ratio of the radius of the wheel to the radius of the axle.

Input and Output ForcesThe Input Force of a wheel and axle is the radius of the wheelThe Output Force of the wheel and axle is the radius of the axle

Wheel and Axle

Real World ExampleA real world example of a wheel and axle is a bike

Bikes function with a wheel that rotates on an axle

Inclined PlaneMechanical Advantage Rule

The mechanical advantage of an inclined plane is equal to the length of the slope divided by the height of the inclined plane.

Input and Output ForcesThe input force is what is going down on the ramp

The Output Force is the ramp itself

Inclined PlaneReal World Example

A real world example an inclined plane is a slide at a park.

The person on the slide would be the input force and the slide would be the output force

Works Cited• www.sicosp.com.au/portable_theater.php

• www.sicosp.com.au/portable_theater.php

• http://www.animation-central.com/gears.htm

• dustbowl.wordpress.com/.../29/oblong-gear-clock/

• www.cagle.com/artists/Lester/main.asp

• http://www.enchantedlearning.com/physics/machines/Levers.shtml

• http://www.uark.edu/depts/aeedhp/agscience/simpmach.htm

• http://user.chollian.net/~boonstra/bikegifs.htm

• http://www.nvsd44.bc.ca/sites/ReportsViewOnePopM.asp?RID=3812#plane

• http://www.animationfactory.com/en/search/index.html?a=AG&q=slide

• www.dugnorth.com/.../simple-machines-kit.jpg

• http://www.cool-science-projects.com/images/man-and-lever.jpg