I think it is a pulley that can slide along a rope without being damaged
friction hitch
http://www.animatedknots.com/prusik/index.php
The practice of climbing using only ropes (not actually climbing the curface of a rock) is Prussicking (or Prusiking). The knot is a Prusik Knot or Prusik Hitch. There are various sites on the internet where the technique and the knot it self is discussed and demonstrated.
There is a crankshaft pulley, alternator pulley, power steering pump pulley, AC pulley, idler pulley, tensioner pulley, etc.
a coumpound pulley is when there is a fixe pulley and movable pulley working together
a coumpound pulley is when there is a fixe pulley and movable pulley working together
pulley
Things that might cause a pulley to wobble: The pulley is bent. The shaft the pulley is on is bent. The pulley is mounted crooked.
No, it is not a pulley. A pulley has to half effort.
Pulley reduces the force given to get the work done. There are amny types of pulleys. Examples are fixed pulley, movable pulley and Combined pulley.
If you pry up on the pulley with a bar on each side of it and while keeping pressure on the pulley, hit the end of the shaft that the pulley is on with a brass mallet, the pulley will usually break free.
With the string from the movable pulley