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What is force?
A push or pull that can change the state of motion or shape of an object
What is a contact force?
Force that acts when two objects are in physical contact. e.g. friction, muscular force
What is a non-contact force?
Force that acts without physical contact. e.g. gravity, magnetic force, electrostatic force
What is friction?
A force that opposes the relative motion between two surfaces in contact
What are the types of friction?
Static friction, sliding (kinetic) friction, rolling friction, fluid friction
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