# Simple Machines

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### Simple Machines:

Simple Machines SOL 3.2

### Machine – a tool that helps us do work:

Machine – a tool that helps us do work Machines help us by: Changing the amount of force on an object. Changing the direction of the force.

### Force is a push or pull that changes the motion or shape of an object. :

Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.

### Energy is the ability to do work. :

Energy is the ability to do work. Example: I must have energy to run the mile.

### Work is the result of force moving an object.:

Work is the result of force moving an object. Example – Picking up something heavy is hard work!

### Gravity :

Gravity Gravity is the force that constantly pulls objects toward Earth.

### Simple machines – have few or no moving parts :

Simple machines – have few or no moving parts Lever Inclined Plane Wedge Screw Wheel and Axel Pulley

### Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight :

Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight Example: seesaw, crowbar, baseball bat, rake

### Inclined Plan – a slanted surface to make lifting easier :

Inclined Plan – a slanted surface to make lifting easier Example: ramp, stairs

### Wedge – two inclined planes together used to raise an object or split an object. :

Wedge – two inclined planes together used to raise an object or split an object. Example: knife, door wedge, ax

### Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. :

Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. Example: drill bit, screws

### Wheel and Axel – a wheel that turns on a post to help move things quickly and easily :

Wheel and Axel – a wheel that turns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver

### Pulley – made of rope and string wound around a reel to change the direction of a force. :

Pulley – made of rope and string wound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel

### Compound Machine – two or more simple machines working together.:

Compound Machine – two or more simple machines working together. Examples: Bike Car

### How Work is Done :

How Work is Done Energy Force Function Work is done!