What is a contact force?

Forces that need to be in contact with object for their effect.

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Forces that do not need to be in contact with object for their effect.

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Both A and B depending on the force.

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Forces that are in contact with the ground.

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Solution

The correct option is A
Forces that need to be in contact with object for their effect.

A contact force is a force that requires physical contact with the object for the force to act. For example, muscular force, frictional force, etc.

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Similar questions

Non-contact forces show their effect only when one object is not in contact with another object.

Two objects always need to be in contact for them to exert force on each other.

Two bodies need to be in contact with each other for a force to act between them.

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