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PULLEYS:are used to raise and lower loads easily because we use our own…
PULLEYS:are used to raise and lower loads easily because we use our
own weight to counteract them
Fixed pulleys
A fixed pulley is a wheel that has agroove for a rope, to go roundlt.
It rotates around an axle that ls fixed toan immobile surface.
This reduces the load.R when elfort, f, is applied
is balanced when the effort, F, isequal to the load. R
F=R
uses:
wells
gym equipment
Compound pulleys
set of fixed and moveable pulleys called
block
tackle
If we use more pulleys it becomes more complex
but less effort
is needed to move the load
first example: F=R/2xn
second example: F=R/2n
uses:
in passenger lifts
goods lifts
cranes
Moveable pulleys
has two pulleys:
one
is fixed
the other can move in a linear
direction
is balanced when it iulfils
this equation:
F=R/2
.
