Question

4. In a collision which of the following quantities is always conserved? A). Acceleration B). Energy C). Kinetic Energy D). Momentum 5. If the applied force is perpendicular to the motion of the object then the Work done by the force is ___ A). Negative B). Positive C). Zero 6. A car, travelling at 40m/s slows to 10m/s in 5 seconds. What was the acceleration? A). -6 m/s? B). -4m/s2 C).-2 m/s2 D). -9.8m/s 7. A ball thrown straight up takes 3 seconds to reach its maximum height. The height is most nearly A). 30m B). 45m C). 60m D). 90 m 8. A driver of a car wishes to pass a truck on the highway. Her car can accelerate at a constant 5m/s. How long does it take to increase her speed from 30 m/s to 60 m/s? A). 100 s B). 10 s C).6s D). 4 s 9. A net force of 25 N produces an acceleration of 5 m/s on a lab cart. Its mass is A). 30 kg B). 125 kg C). 3 kg D). 5 kg 10. A net force gives a 10 kg object an acceleration of 2 m/s?. If the same force were applied to a 40 kg object, i would A), travel at a constant 0.5 m/s. B), accelerates at 0.5 m/s. C), accelerates at 1 m/s?. D)have a momentum of 20 kg m/s. 11. A 500 g yo-yo is swung on the end of a 50 cm string at a constant speed of 2 m/s. The centripetal force act on the yo-yo is A). 2N B). 4 N C). 8N D). 10 N 12. When you throw a ball into the air, its kinetic energy A). equals map B). equals the work you did on the ball C). is converted to potential energy as it goes higher. D). all of the above. 13. How much work can a 50.0 kg wrecking ball traveling at 10.0 m/s do to the building it strikes?

Answer 1

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