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CHAPTER EIGHT

CHAPTER EIGHT. FRICTION. Friction Contd.

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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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