Question

Which of these statements about lever is not true?

It amplifies the input force.
It is used to lift heavy weights with minimum amount of force.
It is used to split and cut the objects.
It is a rigid bar or rod pivoted on a fixed support.

Answer 1

Answer:

2

Explanation:

it is used to lift heavy weights

Answer 2

Answer:

(a) A machine is a device by which we can either overcome a large resistive force at some point by applying a small force at a convenient point and in a desired direction or by which we can obtain a gain in the speed.

(b) An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.

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