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AugustusWaters AugustusWaters
  • 22-05-2014
  • Physics
Answered

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

Verified Answer :

AL2006
AL2006 AL2006
  • 23-05-2014

"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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