Physics Quiz 2, Question from Laws of Motion.

1. When a bus suddenly takes a turn, the passengers are thrown outwards because of ?




Answer is A)


2. A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball fall ?




Answer is D)


3. A train is moving with velocity 20 m/sec. on this, dust is falling at the rate of 50 kg/min. The extra force required to move this train with constant velocity will be ?




Answer is A)


4. Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller force and magnitude of resultant is 12. Then the magnitudes of the forces are ?




Answer is B)


5. The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is ?




Answer is B)


6. A weightless ladder, 20 ft long rests against a frictionless wall at an angle of 60o with the horizontal. A 150 pound man is 4 ft from the top of the ladder. A horizontal force is needed to prevent it from slipping. Choose the correct magnitude from the following ?




Answer is C)


7. A cricket ball of mass 150 gm is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. The force of blow acts for 0.01s on the ball. The average force exerted by the bat on the ball is ?




Answer is A)


8. You are on a frictionless horizontal plane. How can you get off if no horizontal force is exerted by pushing against the surface ?




Answer is B)


9. A ball of mass 150g moving with an acceleration 2 20m / s is hit by a force, which acts on it for 0.1 sec. The impulsive force is ?




Answer is C)


10. A force of 50 dynes is acted on a body of mass 5 g which is at rest for an interval of 3 seconds, then impulse is ?




Answer is C)


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