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# lecture5 - Chapter 5 Using Newtons Laws Friction Circular...

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Chapter 5 Using Newton s Laws: Friction, Circular Motion, Drag Forces

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Forces of Friction When an object is in motion on a surface, there will be a resistance to the motion, called the force of friction F fr,s = µ s F N (not a constant) F fr,k = µ k F N (constant)
Some Coefficients of Friction

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Friction in Newton s Laws Problems • Friction is a force, so it simply is included in the F fr in Newton s Laws • The direction of the force of friction is against motion • The determination of magnitude of the force of friction needs the normal force, F N .
Two blocks connected by a rope of negligible mass are being dragged by a horizontal force F . Suppose that F = 100.0 N, m 1 = 10.0 kg, m 2 = 20.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.200. – (a) Draw a free-body diagram for each block. – (b) Determine the tension T and the magnitude of the acceleration of the system.

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Box A, of mass 10.0 kg, rests on a surface inclined at 37° to the horizontal. It is connected by a lightweight cord, which passes over a massless and frictionless pulley, to a second box B, which hangs freely as shown. If the coefficient of kinetic friction is 0.30, and m B = 10.0 kg, determine the acceleration of the system.
A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force F =80N as shown in the figure . The coefficient of static friction between all surfaces is 0.50 and the kinetic coefficient is 0.40. What is the acceleration of each block?

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lecture5 - Chapter 5 Using Newtons Laws Friction Circular...

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