Page 19 - SIMPLE MACHINES

B. Movable pulley –
B . M ov abl e p u l l e y –

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A
• •A movable pulley moves along a rope
or wire. It causes increase in force.
o r w i r e . I t c a u s e s i n c r e a s e i n f o r c e .
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p
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• •A movable pulley works like a
b

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turning second class lever. The
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T
he

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fulcrum is at one rim of the pulley
f u l c r u m i s a t o n e r i m o f t he p u l l e y
wheel, the load is at the axle, and
w he e l , t he l o a d i s a t t he a xl e , a n d
the force is at the other rim of the
t he f o r c e i s a t t he o t he r r i m o f t he
p u l l e y w he e l .
pulley wheel.
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• •It is not fixed to any kind of

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support and is free to move. It is
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generally used in combination with a
ge n e r a l l y u s e d i n c o m b i n a t i o n w i t h a
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.
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fixed pulley.
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