contestada

In a pulley setup that has a moving pulley, _____
A. You have to pull the string a greater distance, and it takes more work to lift the mass
B. Your work doubles because the pulley moves
C. You have to pull the string a greater distance, but the force needed to lift the mass is cut in half
D. You don't have to pull very much to lift the mass

Respuesta :

anonymous79
the answer is d
the whole purpose of pulley system is to save work

Answer:

D. You don't have to pull very much to lift the mass.

Explanation:

With a moving pulley you don't have to pull very much to lift the mass, because this pulley distributes better the weight, requiring a lower force to lift than using a simple pulley.

So, basically, in this type of system, the force needed is less, however, to know if is half less or even a minor proportion, we need to use specific values, that's why option C is not the answer, because with the data given, you cannot calculate if the force needed is the half.

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