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