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5. Laws of Motion
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Q7 of 21 Page 109

A body constrained to move in the y-direction is subjected to a force N. The work done by this force in moving the body through a distance of 10 m along y-axis ithe s?


is applied to a body that is coa nstraint to move in y the direction


Given: displacement along y-axis = s


Let, work done = W


We know,





Hence, work done by the force in moving the body through a distance of 10 m along y-axis = 150 J


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5

A man of mass 60 kg is standing on a light weighing machine kept in a box of mass 30 kg. The box is hanging from a pulley fixed to the ceiling through a light rope the other end of which is held by the man himself. If he manages to keep the box at rest

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(b) What force should the man exert on the rope to get his correct weight on the machine?

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A block of mass 2kg rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.7. What is the magnitude of the friction force on the block? (g = 9.8 ms–2)

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If a bullet of mass 5 grams moving with velocity 100 ms–1 penetrates the wooden block up to 6 cm. Then the average force imposed by the bullet on the block is

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Questions · 21
5. Laws of Motion
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