A person pulls horizontally with a 10 N force on block B, causing both blocks to

Question

A person pulls horizontally with a 10 N force on block B, causing both blocks to move horizontally as a unit. There is friction between block B and the horizontal table. The mass of block A is 1 kg and the mass of block B is 3 kg. (a) If two blocks are moving to the right at constant velocity, what is the friction force between A and B surface? What is the friction force between the table and B? (b) If two blocks accelerating to the right at constant acceleration a = 1 m/s2, what is the friction force between A and B surface? What is the friction force between the table and B?

Explanation / Answer

a)

Since there is no acceleration net force is zero

So friction force between A and B is zero

Friction force between B and surface is 10N

b)

Friction force between A and B is f = 1x1 = 1N

Friction between B and surface is 10N

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