A arrow of mass 0.01 kg moving horizontal suddenly strikes a block of wood of mass 8.6 kg that is suspended by a light string, like a pendulum. The arrow passes through the wood, then the wood swings upward and momentarily stops when the string is horizontal. The length of the string is 2.0 cm. How long did it take the arrow to go through the wood if the friction force between the bullies and the wood is 100 N?

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Q: m1 h m2 4.00 m/s m2

A: m1 = 0.5 kg m2 = 3 kg g = 9.8 m/s2initial speed of the system = 0 m/s

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A: Impulse = change in momentum  Impulse = 6500×(0-95×5÷18) Impulse= 171527.77kgm/s

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A: To solve the question, we will use the conservation of momentum.

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.