Ppt Pulleys

1. Pulleys

2. Definition
A pulley is a grooved
wheel with a rope,
chain, or cable
running along the
groove.

3. Fixed Pulleys
A fixed pulley is similar to a 1
st
class lever!
The wheel is the fulcrum and the rope on
both sides is the effort and resistance!
A fixed pulley is attached to something that
doesn’t move, like the ceiling or wall
–Ex: Elevator
Fixed pulleys do NOT increase force. They
only change direction. Small IMA!

4. Fixed Pulleys

5. Movable Pulleys
A movable pulley is one in which one end of
the rope is fixed and the wheel is free to
move.
Movable pulleys DO increase force and
therefore can have a large MA!

6. Movable Pulleys

7. Block and Tackle Pulleys
Block and tackle pulleys are a combination
of fixed and movable pulleys.
They can have a large MA!

8. Block and Tackle Pulleys