A force occurs when two or more objects interact. They are either:
Contact forces - the objects are actually touching
E.g the tension as two people pull against one another
Non-contact forces - the objects are not touching
E.g the force of gravity acts even when the objects are not touching
Contact forces: friction, air resistance, tension, normal contact force, upthrust
Non-contact forces: gravitational force, electrostatic force, magnetic force
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