a glass top table is very smooth but even when a rolling ball stops after some time why
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It is because a frictional force acts on the ball which opposes the motion of the ball and hence after some time, it stops. It is because friction acts of an object in contact with a surface.
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The force of friction acts between the two surfaces by opposing the relative motion of one surface over the other. For example, when the ball rolls on the ground, the force of friction acts between the surface of the ball and the surface of the ground. The irregularities between the two surfaces lock into each other and thus, stop the ball from moving any further unless it is moved by an external force.
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