Q17 of 20 Page 62

Water sprinkler used for grass lawns begins to rotate as soon as the water is supplied. Explain the principle on which it works.

The working of the rotation of sprinkler is based on third law of motion. As the water comes out of the nozzle of the sprinkle, an equal and opposite reaction force comes into play so the sprinkler starts rotating.


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15

A truck of mass M is moved under a force F. If the truck is then loaded with an object equal to the mass of the truck and the driving force is halved, then how does the acceleration change?

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Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it. How will this activity affect the position of the two? Explain your answer.

 18

Using second law of motion, derive the relation between force and acceleration. A bullet of 10 g strikes a sand-bag at a speed of 103 ms-1 and gets embedded after travelling 5 cm. Calculate:

(i) The resistive force exerted by the sand on the bullet


(ii) The time taken by the bullet to come to rest.

 19

Derive the unit of force using the second law of motion. A force of 5N produces an acceleration of 8 m s–2 on a mass m1 and an acceleration of 24 m s–2 on a mass m2. What acceleration would the same force provide if both the masses are tied together?