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What is a contact force?
A force that occurs when two objects are physically touching.
What is a non-contact force?
A force that acts between objects that are not physically touching.
Give examples of contact forces
Friction, air resistance, tension, normal contact force.
Give examples of non-contact forces
Gravitational force, magnetic force, electrostatic force.
What is friction?
A contact force that opposes motion between two surfaces in contact.