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Hereof, can a ball roll forever?
So the ball should roll on forever.The ball only stops rolling because an external force(friction) causes the ball to stop.
Beside above, why do objects eventually stop moving?
Newton's first law of motion states that "Anobject at rest stays at rest and an object inmotion stays in motion with the same speed and in thesame direction unless acted upon by an unbalanced force." Movingobjects, so it was believed, would eventually stopmoving; a force was necessary to keep an objectmoving.
The ball rolls because: the friction presentbetween the surface pushes the atoms/particles in contact withsurface or ground backwards, hence with centre of mass moving in adirection, the ball's bottom surface(ie. The surface incontact) moves in opposite direction or backwards, causing theball to roll.