Question

Write short notes on
(a) frictional force
(b) gravitational force
(c) muscular force
​

Answer 1

Explanation:

Frictional force :

Frictional force refers to the force generated by two surfaces that contacts and slide against each other.

Gravitational force  :

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. It is by far the weakest known force in nature and thus plays no role in determining the internal properties of everyday matter.

Muscular force :

Muscular force is the force applied using parts of the body like arms or legs. It is force that results due to the action of muscles, and is a contact force, since there is a contact between the surfaces. Muscular force is needed whenever movement of the body occurs.

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Answer 2

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(a) frictional force ⇨

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.

(b) gravitational force⇨

The earth attracts every object towards it because of the gravitational force. As the earth's centre of mass is at its centre, the gravitational force exerted by the earth on any object is always directed towards the earth's centre. Hence, an object released from a point above the earth's surface falls vertically downward towards teh earth. If n object is thrown vertically upward. it svelocity geos on decreasing due to the earth's gravitational force on the object. At one stage, the velocity of the body becomes zero and later the body falls back to the earth.

(c) muscular force⇨

Muscular power is the power applied utilizing portions of the body like arms or legs. It is a force that results because of the action of muscles and is a contact force since there is contact between the surfaces. Muscular force is required whenever the movement of the body occurs.

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