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LEVERS:

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.

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LEVERS:

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  1. LEVERS:

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

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

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