FIXED PULLEY
A fixed or class 1 pulley has a fixed axle. That is, the axle is "fixed" or anchored in place. A fixed pulley is used to change the direction of the force on a rope (called a belt). A fixed pulley has a mechanical advantage of 1.
The total weight on this pulley is 1,0 N
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MOVABLE PULLEY
A movable or class 2 pulleys has a free axle. That is, the axle is "free" to move in space. A movable pulley is used to multiply forces. A movable pulley has a mechanical advantage of 2. That is, if one end of the rope is anchored, pulling on the other end of the rope will apply a doubled force to the object attached to the pulley.
The weight of the object is 1 N
The weight of the pulley is 0.3 N
The total weight of this pulley is 1 + 0.3 = 1.3/2
= 0.65 N = 0.7 N
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COMPOUND PULLEY
A compound pulley is a combination of a fixed and a movable pulley system. Compound pulley has a mechanical advantage according as many as the pulley. And for this pulley the mechanical advantage is 3.
The weight of the object is 1.5 N
The weight of the pulley is 0.3 + 0.8 = 1.1
The total weight of this pulley is
1.5 + 1.1 = 2.6 / 3
= 0.866 N
= 0.87 N
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