Asked by: Naray Subirada
science physics

Why does a freely rolling ball eventually stop?

Last Updated: 16th May, 2020

When you roll a ball on the ground, theelectrons in the atoms on the surface of the ground push againstthe electrons in the atoms on the surface of your ball thatis touching the ground. A rolling ball stops becausethe surface on which it rolls resists its motion. A rolling ballstops because of friction.

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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.

One may also ask, why does an object moving on a smooth surface stops by itself? The object doesn't stop by itself; itstops because of friction between itself and thesurface. If you said “frictionless,” itwould slow down because of air resistance, but itwould never actually stop, because the air resistanceforce decreases as its speed decreases.

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.

What causes a ball to roll?

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.

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