THE PHYSICS AND A PULLEY

So today we are going to talk about some of the physical properties of the pulley and how this properties affect the mechanical advantage of a pulley.
physical properties:_A set of pulleys assembled so that they rotate independently on the same axle form a block. Two blocks with a rope attached to one of the blocks and threaded through the two sets of pulleys form a block and tackle.

A block and tackle is assembled so one block is attached to fixed mounting point and the other is attached to the moving load. The ideal mechanical advantage of the block and tackle is equal to the number of parts of the rope that support the moving block.

This is a Gun Tackle pulley

In the diagram on the right the ideal mechanical advantage of each of the block and tackle assemblies^[5] shown is as follows:

• Gun Tackle: 2
• Luff Tackle: 3
• Double Tackle: 4
• Gyn Tackle: 5
• Threefold purchase: 6

So for today this all that I have to teach, see you the next time.