A ball is rolled on the ground and it comes to rest after sometime even though no force is applied
Answers
A ball rolling along the ground gradually slows down and finally comes to rest is an example of what?
It is an example of Newton’s 1st law i.e. : Every body continues in its state of rest or uniform motion unless it is acted upon by external forces.
Here external forces are air resistance, ground resistance ( though very very small), gravity pull etc.
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The ball is coming to rest not because of friction but because air resistance or drag force which act in the opposite direction of the motion of the ball .
As the ball translational velocity decreases due to air resistance, the friction force acts in direction of the motion of the ball and hence it increases the translational velocity and decreases the angular velocity till translational velocity becomes equal to the product of the angular velocity and the radius of the ball due to which the point of contact stays at rest
Vtrans = W*R
W = angular velocity
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A ball rolling on the ground slows down due to the force of friction.
Reason :
Friction is the resistance that one surface of an object encounters when another one touches it.
The force of friction always acts in the opposite direction to the applied force . It opposes the motion of the body and tries to stop .
Hence the ball slows down and finally stops.
:)