# A disc of circumference  is at rest at a point on a horizontal surface when a constant horizontal force begins to act on its centre. Between and  there is sufficient friction to prevent slipping and the surface is smooth to the right of . The disc moves from  to  in time . To the right of , a) The angular acceleration of the disc will disappear, linear acceleration will remain unchanged b) Linear acceleration of the disc will increase c) The disc will make one rotation in time d) The disc will cover a distance greater than in further time

## Question ID - 100668 | SaraNextGen Top Answer A disc of circumference  is at rest at a point on a horizontal surface when a constant horizontal force begins to act on its centre. Between and  there is sufficient friction to prevent slipping and the surface is smooth to the right of . The disc moves from  to  in time . To the right of , a) The angular acceleration of the disc will disappear, linear acceleration will remain unchanged b) Linear acceleration of the disc will increase c) The disc will make one rotation in time d) The disc will cover a distance greater than in further time

Answer Key / Explanation : (b,c,d) -

(b,c,d)

Let external force,  force of friction between  and =acceleration between  and , = acceleration beyond

Let  angular acceleration between and

For one rotation,

= time of travel from to

Angular velocity at

For one rotation to the right of