What happens in a pulley setup that has a moving pulley?
a) The work doubles because the pulley moves.
b)The string doesn't have to be pulled very much to lift the mass.
c) The string has to be pulled a greater distance, but the force needed to lift the mass is cut in half.
d) The string has to be pulled a greater distance, and it takes more work to lift the mass.
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In a ‘pulley setup’ that has a ‘moving pulley’ -- The string has to be ‘pulled a greater distance’, but the force needed to’ lift the mass’ is cut in half.
Option: (c)
Explanation:
- There is a mechanical advantage that is got from the movable pulleys which are the measure of performance for machines.
- This means that the force which is applied in the system is more than the force that has been put into pulling the rope.
- The pulley is able to ‘lift the object’ with a larger than what is applied to the rope which helps in lifting the object.
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It is easier to lift the same load by using three-pulley system than by using two-pulley system.
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