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|A force that is exerted when one object comes
into contact with another is called a contact
eg when a ball is kicked.
One contact force that is very important in
our lives is friction.
However, not all forces are applied through
actual physical contact.
the force of a gravitational field
The ball that was kicked in the animation opposite
returns to earth eventually, as the gravitational field of the Earth acts
the force of a magnetic
the force of an electric
field, as we saw in our electrostatic experiments