Question

A system of pulleys is used to raise a load of bricks that weighs 1,700 newtons. The force applied to the pulley is 340 newtons. What’s the mechanical advantage of this machine?

Answer 1

Answer:

According to the Free Body Diagram of pulley system:

MA = W/T = n.

Here, MA is the mechanical advantage, W is the load, T is the tension, and n is the number of sections of rope supporting the load.

Let's calculate the ratio: 1700/340 = 5

Which means the T = 1/5 W, it can be achieved by compound pulley system with 4 or 5 pulleys.

So MA = 5, this is your answer. 

Answer 2

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ATQ,

Weight of bricks = 1,700N

Force applied on pulley=340N

The force that is required to left

the bricks against force due to gravity

=1,700-340

=1360N

So, with the help of machine we can do a machinal work against the force of gravity

☺️✌️✌️

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