mechanims (pulleys)
many different uses
moving people from one place to another
telling the time
entertainig children in a park
raising or lowering objets
click to edit
mechanims
dirving force
output elements
pulleys
Fixed pulleys
Moveable pulleys
Compound pulleys
A fixed pulley is balanced when the effort, F, is equal to the load, R
F = R
is a wheel that has a groove for a rope, chain or belt to go round it
A moveable pulley is balanced when it iulfils
F = R \ 2
A moveabie pulley has two pulleys
The effort needed to move a load with a
moveable pulley is half oi the effort needed
with a fixed pulley
This is a set of fixed and moveable pulleys, often called a block and tackle
Here are some difierent types of block and tackle
F= R \ 2 x n
F = R \ 2"