Which of the following forces is/are the types of contact force?

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Muscular force

Force of friction

Gravitational force

Both 1 and 2

answer is D.

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Detailed Solution

Both muscular force and frictional force are contact forces.
Contact forces are the forces that exist only and only when the bodies come into contact with each other. From the options mentioned, the muscular force and the force of friction are the types of contact force because we cannot feel a force on our body until and unless the body comes in contact with us and exerts a force. Similarly, the force of friction can't exist until and unless two bodies don't come in contact with each other and, in some cases, rub each other. Besides these, gravitational force is a non-contact force because it can exist even when contact between two bodies occurs.

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