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23 April, 00:59

How do contact forces such as friction differ from gravitational and magnetic forces?

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  1. 23 April, 03:47
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    "Contact" means "touching". A contact force can't act on an object unless

    they're touching. Friction is a contact force.

    Gravitational forces pull masses together even if they're not touching.

    Magnetic forces pull a piece of iron toward a magnet even if they're not touching.

    Gravitational and magnetic forces are "non-contact" forces.
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