contact forces,friction force,normal reaction and viscous force all are electomagnetic forces,explain.?????????????

Dear student,

Friction is a force that is created whenever two surfaces move or try to move across each other. 

• Friction always opposes the motion or attempted motion of one surface across another surface.
• Friction is dependant on the texture of both surfaces.
• Friction is also dependant on the amount of contact force pushing the two surfaces together

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