Pulley
HERE ARE SOME FACTS ABOUT THE PULLEY:
The pulley is used in a bunch of different ways, there is more than one type of pulley too. There are four types of pulleys. They are single fixed, single movable, single fixed-single movable #1 and single fixed-single movable #2.
Some examples of pulleys are:
-flag pole
-block and tackle
-oil derricks
-winch
-rock climber pulleys
-clothes line
-steam shovel
FIXED PULLEY:
A pulley that is attached to a structer is a fixed pulley. The wheel on the pulley turns, but the pulley itself does not move. A fixed pulley does not multiply the force of the effort.
MOVABLE PULLEY:
A movable pulley is attached to an object that is moving. One end of the rope is attached to a stable structer, while the other supporting rope is free to move. The end of the rope that is moving goes down through the pulley attached to the rope and back up through the top.
Dictionary Definition: A wheel, with a grooved rim for carring a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines.
