Question

A long crow-bar is used to over through the big stone.Why ?

Answer 1

Answer:

It means a force 5 kg will be able to lift the 50 kg stone with a rod of 6 feet length (BC+ BA). This is how a crow bar is used. It is an oversimplified example of using a lever that gives substantial mechanical advantage. Hope this clarifies the point.

Explanation:

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Answer 2

Answer:

A heavy stone can be liften by a crow bar because it’s load arm is smaller than the effort arm and which tells us that the mechanical advantage is greater than 1. We know that when we have M.A. greater than 1 it acts as a force multiplier which helps us overcome a large resistive force (heavy stone).