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Simple Machines Make Our Work Easier!. What is a Simple Machine?. A simple machine has few or no moving parts. Simple machines make work easier. Scientists have identified six different simple machines: lever, screw, pulley, wedge, inclined plane, and wheel and axle. Wheels and Axles.

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What is a simple machine
What is a Simple Machine?

  • A simple machine has few or no moving parts.

  • Simple machines make work easier.

  • Scientists have identified six different simple machines: lever, screw, pulley, wedge, inclined plane, and wheel and axle.


Wheels and axles
Wheels and Axles

  • The wheel and axle together form a simple machine.

  • The axle is a rod that goes through the wheel allowing the wheel to turn.

  • Gears are a form of wheels and axles.


Pulleys
Pulleys

  • Pulley are wheels and axles with a groove around the outside.

  • A pulley needs a rope, chain or belt around the groove to make it do work.


Inclined planes
Inclined Planes

  • An inclined plane is a flat surface that is higher on one end.

  • Inclined planes make the work of moving things easier.


Wedges
Wedges

  • A wedge consists of two inclined planes joined back to back.

  • Wedges are used to split or cut things.


Screws
Screws

  • A screw is an inclined plane wrapped around a shaft or cylinder.

  • The inclined plane allows the screw to move itself when rotated.


Levers first class
Levers-First Class

  • In a first class lever the fulcrum is in the middle and the load and effort is on either side.

  • A see-saw is a good example of a first class lever.


Levers second class
Levers-Second Class

  • In a second class lever the fulcrum is at the end, with the load in the middle.

  • A wheelbarrow is a good example of second class lever.


Levers third class
Levers-Third Class

  • In a third class lever the fulcrum is again at the end, but the effort is in the middle.

  • A pair of tweezers is a good example of a third class lever.


Simple machines
Simple Machines

Simple Machines can be put together in different ways to make complex machinery.