Method To Find The Direction Of Frictional Force

Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated. (a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins. (b) What is the force of friction after perfect rolling begins?

Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated. (a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins. (b) What is the force of friction after perfect rolling begins ?

Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated. (a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins. (b) What is the force of friction after perfect rolling begins ?

(i) Explain why friction is necessary to make the disc to roll in the direction indicated. (ii) Give the direction of frictional force at B , and the sense of frictional torque, before perfect rolling begins. (iii) What is the force of friction after perfect rolling begins?

(i) Explain why friction is necessary to make the disc to roll in the direction indicated. (ii) Give the direction of frictional force at B , and the sense of frictional torque, before perfect rolling begins. (iii) What is the force of friction after perfect rolling begins?

When a bicycle moves in the forward direction what is the direction of the frictional force in the rear and front wheels