SCIE 4001
3.5 Simple Machines
3.5 Levers
3.5 Wheel & Axle
3.5 Inclined Plane
3.5 Pulley
3.5 Screw
3.5 Wedge
 

Unit 3 STRUCTURE AND MECHANISMS

3.5 Pulley

pulley

A pulley is a wheel with a groove along its edge, where a rope or cable can be placed.

— It applies the principle of applying force over a longer distance
— It changes the direction of the applied force.
— Complex pulley systems of can be used to generate large forces, especially for lifting objects.

screw
When a single pulley is used this way, effort = ½load.
wheel and axle
When a single pulley is used this way, effort = load.
pulley
Pulleys may also use chains.
london eye

Pulleys can be used to drive other pulleys.

— If the driving pulley is smaller the rotation speed is reduced (force multiplier)
— If the driving pulley is larger the rotation speed is increased (distance multiplier)

pulley
Pulleys are use to lift loads through windows when internal structures are too small to pass.
pulley
Different complex systems and load to effort ratio.
   

 

 

Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.