Pulley

By Hannah Braem, Noor Bairuty

Define

A pulley is designed to support movement of a cable or belt along its circumference. Pulleys are used in a variety of ways to lift loads, apply forces, and to transmit power.

Examples

  • Flag poles
  • Window blinds
  • Water Well
  • Wench
  • Rock climber pulley
  • Sails

Mechanical advantage

To in increase the mechanical advantage of a pulley, increase the number of support ropes. The mechanical advantage of a pulley equals the number of support ropes.

Pulleys lose energy thru friction in the wheels and when the ropes stretch

Example problem

40/3

Jake and jay both have to raise the school flag on the flag pole. If the input force is 40 and the output force is 3 what is the AMA?

Pulleys - simple machines

Facts about pulleys!

Pulleys are used to lift objects such as bricks, machines and are also found in the form of cranes. Some interesting facts about pulleys are that they can be made at home by using a stick and some string. No one inventor can be appreciated for creating the pulley because many people used it before that time as well.