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CHAPTER EIGHT

This chapter explores the concept of friction, emphasizing the forces that arise between two bodies in relative motion. Friction acts along the line of contact, opposing the direction of motion. Notably, actual movement is not required for friction to occur; even a tendency to move induces frictional forces. Additionally, the role of Newton’s Third Law in understanding these interactions is highlighted, illustrating how forces balance in systems without external constraints.

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CHAPTER EIGHT

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  1. CHAPTER EIGHT FRICTION

  2. Friction Contd. • Whenever there is relative motion between two bodies in contact, frictional force will develop along the line of contact. The direction of action of the frictional force on one of the bodies e.g. A is such as to oppose the direction of the relative motion of A with respect to B. Similarly for B.

  3. Friction Contd. A VA F B VB VA > VB

  4. Friction Contd. • For friction to exist, actual relative motion is not necessary. • It is sufficient that there be a tendency to move. • That is if A tends to move relatively to B, without actually moving, frictional forces will be set up.

  5. Solution Concluded

  6. Newton’s Third Law

  7. Solution Concluded • (b)With no cable AB • FC = 0 • i.e. • P = FD = 735.75 N = 736 N

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