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SAI INTERNATIONAL SCHOOL



                               CLASS-IX   PHYSICS HOME ASSIGNMENT-9


                                                      OBJECTIVE


               MCQ

               1.A goalkeeper in a game of football pulls his hands backwards after holding the ball
               shot at the goal. This enables the goalkeeper to:

                (a)Exert large force on the ball
               (b) Increases the force exerted by the ball on hands


               (c) Increase the rate of change of momentum


               (d) Decrease the rate of change of momentum

               2.An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less
               horizontal table. The force required to keep the object moving with the same velocity is:


               (a) 32 N

               (b) 0 N


               (c) 2 N

               (d) 8 N


               3. Which of the following situations involves the Newton’s second law of motion?


               (a) A force can stop a lighter vehicle as well as a heavier vehicle which are moving

               (b) A force exerted by a lighter vehicle on collision with a heavier vehicle results in both
               the (vehicles coming to a standstill

               (c) A force can accelerate a lighter vehicle more easily than a heavier vehicle which are
               moving


               (d) A force exerted by the escaping air from a balloon in the downward direction makes
               the balloon to go upwards

               4. The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly.
               What will be the change in momentum of the car?
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