LEVERS:. Pulleys  A pulley is a simple machine that is made up of a single wheel and an axel.  The wheel has a groove around it so a rope or cable can.

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Presentation transcript:

LEVERS:

Pulleys  A pulley is a simple machine that is made up of a single wheel and an axel.  The wheel has a groove around it so a rope or cable can be past over or under it.

Pulleys  A single fixed pulley can be used to make it easier to lift a load.  It does not decrease the size of the force, or effort, needed to lift the load.  It changes the direction of the effort.

Pulleys  It is easier to pull down on a rope to lift a load than it is to push the load.  Your own weight can be used to your advantage.

Pulleys  When more than one pulley is used, a large load can be lifted with a small effort.  A system of two or more pulleys therefore acts as a force multiplier.

Pulleys  Force multipliers increase the size of the effort, however, there is a cost.  The rope or cable needs to be pulled through a large distance to move a load a small distance.

Block and Tackle Pulleys  A multiple pulley system is called a block and tackle.  The block is the frame around the pulleys.  The tackle is rope or cable joining the load to the effort.

Block and Tackle Pulleys  With a block and tackle it is possible to lift many times your own weight.