CONTACT FORCES, THEY ACT WHEN TWO BODIES COME INTO PHYSICAL CONTACT, TWO BODIES COLLIDE, CHANGE THE DIRECTION, HOLD AN OBJECT, FRICTIONAL FORCE, DEFORM, PUSH AN OBJECT, ACTION-AT-A-DISTANCE FORCES, THESE FORCES ACT WITH NO NEED OF PHYSICAL CONTACT, GRAVITATIONAL FORCE, MAGNETIC FORCE, ELECTRIC FORCE

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