what value does counting the number of support strings give you?
Please rewrite the question , question is not clear thanks
what is the purpose of a fixed pulley?
The purpose of a fixed pulley is to change the direction of the force. The fixed pulley does not have a multiplicative property of force, that means that the force does not necessarily increase. The usefulness is related to the desired direction of movement.
How does the pulley help us do work?
It helps reverse the direction of an individual’s lifting force. As a user pulls a rope down, the pulley lifts the weight up. When two ropes and wheels are used, a pulley reduces the effort needed to lift a weight by half.