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# Simple Machines Make Our Work Easier! - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Simple Machines Make Our Work Easier!' - misty

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Presentation Transcript

• 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.

• 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.

• 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.

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

• Inclined planes make the work of moving things easier.

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

• Wedges are used to split or cut things.

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

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

• 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.

• 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.

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