1. | Science is a body of knowledge that |
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2. | As an object freely falls downward, its |
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3. | A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that |
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4. | The gain in speed each second for a freely-falling object is about |
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5. | A package falls of a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is |
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6. | According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains. |
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7. | A scientific statement that can never be changed is a scientific |
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8. | If no external forces are acting on a moving object it will |
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9. | Galileo's use of inclined planes allowed him to effectively |
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10. | The two measurements necessary for calculating average speed are |
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11. | A horse gallops a distance of 10 kilometers in a time of 30 minutes. It's average speed is |
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12. | A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval it acceleration is |
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13. | A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected the force required to keep the puck sliding at constant velocity is |
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14. | Twelve seconds after starting from rest, an object falling freely will have a speed of |
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15. | If an object moves with constant acceleration, its velocity must |
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16. | A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always |
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17. | If a car accelerates form rest at 2 meters per second per second, its speed 3 seconds later will be about |
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18. | At on instant an object in free fall is moving downward at 50 meters per second. One second later is speed should be about |
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19. | Starting from rest, the distance a freely-falling object will fall in 1.0 second is about |
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20. | An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of |
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21. | If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance and after it leaves your hand) will be |
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22. | If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about |
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23. | When a rock thrown straight upwards gets tot he exact top of its path, its |
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24. | A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds? |
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25. | Which has a greater mass? |
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26. | Strange as it may seem, it is just as hard to accelerate a car on a level surface on the oon as it is here on the Earth. This is because |
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27. | The newton is a unit of |
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28. | A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass? (gravity on the moon is one-sixth of that on Earth) |
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29. | A 10-kg brick and 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is |
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30. | The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is |
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31. | Whenever the net force on an object is zero, its acceleration |
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32. | A 1-kg mass at the earth's surface weighs |
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33. | A 10-N falling object encounters 4 N of air resistance. The net force on the object is |
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34. | An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be |
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35. | An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration |
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36. | Hang from a pair of gym rings and the upward support forces of the rings will always |
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37. | A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car? |
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38. | An object following a straight-line path at constant speed |
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39. | Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on it |
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40. | The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be |
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41. | If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g (5m/s/s) to a full stop, the skidding time in seconds is |
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42. | If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, |
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