Question

A lever is a simple machine that is free to move about a point called:
A) Effort.
B) Load.
C) Fulcrum.
D) Wheel.

Answer 1

Hint: The lever is the simplest type of machine which is used to lift loads and it is capable of rotating on a point. A compound lever is one which comprises several levers which are connected in series the power is transferred from one lever to another and which can be used to lift heavy objects.

Complete step by step solution:
It is given in the problem that a lever is a simple machine that is free to move about a point and we need to tell the name of that point. It is the fulcrum at which the lever rotates and we can lift simple objects. According to the Archimedes law of lever, the lever is balanced when the product of the weight and its distance from the fulcrum is equal to the product of weight and fulcrum.

The correct answer for this problem is option (C).

Additional information: The lever was invented to lift objects. There are three types of levers:
Fulcrum between the effort and resistance, the effort is applied on one side of the fulcrum and the load on the other side the mechanical advantage of the lever may be greater than or equal to 1.
The load is between the effort and the fulcrum, the load is applied on one side of the resistance and the fulcrum is on the other side. Mechanical advantage is always greater than 1.
Effort is between fulcrum and resistance, the load is on one side of the effort and the fulcrum is on the other side.

Note: A mechanical advantage is the amplification achieved by using any mechanical device or machine system. The lever amplifies the applied load and thus provides a mechanical advantage with which the objects can be lifted.