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Machine – a tool that helps us do work Machines help us by: 1.Changing the amount of force on an object. 2. Changing the direction of the force.
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. Example: I must have energy to run the mile.
Work is the result of force moving an object. Example – Picking up something heavy is hard work!
Gravity Gravity is the force that constantly pulls objects toward Earth.
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 Example: seesaw, crowbar, baseball bat, rake
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. 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. Example: drill bit, screws
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. Example : flagpole, clothesline, cranes, fishing reel
Compound Machine – two or more simple machines working together. Examples: Bike Car
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Simple Machines Simple Machines are tools that make work easier and have few or no moving parts. Most simple machines make work easier by trading the amount.
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MACHINES Devices that make work easier by changing the size and/or the direction of the force. They will not do work for you.
Simple and Complex Machines Simple Machines- the ability to do work Complex Machines- two or more simple machines that work together to do work.
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Simple Machines. General Information Simple machines are tools that make work easier. Simple machines have few or no moving parts. Simple machines.
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