 A pulley is a wheel with a groove along its edge for holding a rope or cable.  It’s a simple machine that helps change the direction and point of application.

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Presentation transcript:

 A pulley is a wheel with a groove along its edge for holding a rope or cable.  It’s a simple machine that helps change the direction and point of application of a pulling force.

 The pulleys were invented by the Greeks but other people like Benjamin Franklin made copies of the invention.

The pulley was invented to make things easer to lift and saved people a lot of time.

 makes things easer to lift  it is very simple  pulleys are very quiet  Takes up lots of space.  parts of a pulley can rust.  It can break.

Using different materials to make it. It could also change by going automatically.

and the end