Question Answers

Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 6 - System of Particles and Rotational Motion > A cylinder of mass 10 kg and radius 15 cm is rolling perfectly on a plane of inclination 30^o . The coefficient of static friction μs ​= 0.25. (a) How much is the force of friction acting on the cylinder ? (b) What is the work done against friction during rolling ? (c) If the inclination θ of the plane is increased, at what value of θ does the cylinder begin to skid, and not roll perfectly ?

A cylinder of mass 10 kg and radius 15 cm is rolling perfectly on a plane of inclination 30^o . The coefficient of static friction μs ​= 0.25. (a) How much is the force of friction acting on the cylinder ? (b) What is the work done against friction during rolling ? (c) If the inclination θ of the plane is increased, at what value of θ does the cylinder begin to skid, and not roll perfectly ?

A hoop of radius 2m weight 100kg. It rolls along a horizontal floor so that its centre of mass has a speed of 20cms^−1. How much work has to be done to stop it ?