Contact & Non-contact forces
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External force comes into picture when the body starts moving or comes to rest either by coming in contact with the body or without being in contact .
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Contact force- force applied by coming in contact with the body
Example : hitting of cricket ball with bat in game
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Non-contact force- force applied without coming in contact with body
Example : coin attracted towards magnet ( magnetic force ) ball dropped at height attracted towards the earth ( gravitational force )