PULLEYS

fixed pulleys fixed

compound pulleys compound

moveable pulleys moveable

it rotates around an axle that is fixed to an inmobile surface

is balanced when the effort F is equal to the load R

what is? : is a wheel that has a groove for a (rope, chain or belt) to go round it.

belt

chain

rope

Pulleys are used to raise and lower loads easily

USES: wells, gym equipment

is balanced when it fulfils this equation: F: R/2

has two pulleys

can move in a linear direction while the other is fixed

is fixed while the other can move in a linear direction

The effort needed to move a load with a moveable pulley is half of the effort needed with a fixed pulley

This type of pulley means we can lift weights with less effort.

If we use more pulleys it bei.omes more complex, but less effort is needed to move the load

USES: : ln passenger lifts, goods lifts, cranes

is a set of fixed and moveable pulleys, often called a block and tackle