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Which one of the following forces is a contact force?
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Force of gravity
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Magnetic force
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Electrostatic force
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Force of friction
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It's Wrong!
The force of friction is a contact force because it occurs when two surfaces are in contact with each other and it opposes the motion or tendency of motion between them. It is caused by the irregularities in the surfaces and the interlocking of the microscopic bumps and ridges on the surfaces. This force is experienced in everyday situations such as walking, driving a car, or sliding objects on a table.
