friction is a non contact force contact force magnetic force electrostatic force
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Frictional Force is a force that acts on all moving objects by the surface which it is in contact with. ... Non-contact forces: Forces that arise without the contact of 2 or more objects involved. Examples: Magnetic Force, Electrostatic Force, Gravitational force.
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contact force
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(b) because contact force is a force which requires a contact to occur and friction is a force which always opposes the motion of one body over another body . It acts between two surfaces which are in contact with each other. since friction arises when two bodies are in contact . so friction is a contact force.
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