force
contact
non-contact
newton
push/pull
at-a-distant force
muscular
frictional
magnetic
gravitational
electrostatic
effects
changes direction of an object
stop a moving object
changes the shape and size of the object
changes the speed of a moving object
cannot change the mass of an object
start an object which is at rest
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force acting between two surface and trying to oppose the motion
properties of friction
does not depend on the area of contact
nature of the surface
rough surface-more friction, smooth surface less friction
mass of the body- more mass more friction
static
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rolling
sliding