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2. What are the three major forces discussed in this unit?
Friction
Gravity
Magnetism
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3. What force causes an apple to fall from a tree?
gravity
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4. Click One Time for Answer
What force causes a bicycle to slow down when the rider hits the brakes?
friction
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5. Click One Time for Answer
How would you describe the force in a wrestling match when the two wrestlers are pushing against each other and no on is moving?
Balanced forces
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6. Click One Time for Answer
If a white board magnet begins dropping due to the weight of 20 pieces of paper, how would you describe that force?
unbalanced
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7. How do you know an object is moving?
Its position changes
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8. Click One Time for Answer
What has the most effect on how long it takes a pendulum or swinger to make a complete swing?
Length of the string
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9. What surfaces have the least friction, and which have more friction?
Smooth surfaces
Rough surfaces
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10. How can engineers design objects to reduce air friction/resistance?
Streamlined design with smooth round surfaces
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11. What is present when two surfaces rub together?
Friction
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12. What does friction cause objects to do?
Slow down
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13. What force pulls objects towards Earth?
Gravity
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14. Click One Time for Answer
How does the streamlined, smooth, rounded shape of some cars help them move more easily?
Reduces friction with air
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15. Click One Time for Answer
If two ramps of equal height, equal length, and same surface were used to push, same force applied, to two cans of soup, what would be the best explanation for why one soup can went farther than another?
The mass was probably different
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16. Objects at rest will remain at rest until what?
An outside force acts on it
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17. For ever action there is what?
An equal and opposite reaction
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18. Objects at rest will remain at rest until what?
An outside force acts on it
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19. Click One Time for Answer
When you are in a moving car, why does your sister sitting next to you appear not to be moving?
From your frame of reference, your sister is not moving
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20. Click One Time for Answer
If you are throwing a tennis ball and a kickball with the same force, which one will go farther and why?
Tennis ball because it has a smaller mass and takes less force to move
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21. What do you call it when an object is not moving?
At rest
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22. What is the formula for speed?
Distance divided by time
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23. Click Three Times for Answers
Distance is measured in what? Time is measured in what? Force is measured in what?
Meters
Seconds, minutes, hours, etc.
Newton (after Isaac – apple tree guy)
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24. What is the force that opposes (acts against) motion?
friction
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25. What force is at work when a gravel road slows down a bicycle?
Friction
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26. Click One Time for Answer
In a collision in which one car, sitting at a light, is hit from behind by another car and moves forward from the impact, how would you describe that force?
Unbalanced
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27. Click One Time for Answer
How is force defined?
Push or a pull
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28. What does friction produce?
heat
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29. Click One Time for Answer
What reduces friction?
lubricants
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30. Why do bicyclists wear smooth rounded helmets?
To reduce air resistance
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31. What are the poles on a magnet?
North and South
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32. Click One Time for Answer
What do unlike poles do?
Attract
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33. Click One Time for Answer
What do like poles do?
repel
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34. What material is magnetic?
iron
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35. When is gravity weaker for objects and when are they greater?
When the objects are smaller
When the objects are closer together
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36. Click One Time for Answer
What is the term for a push or pull that causes objects to move, stop, or change directions?
Force
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37. What is the term for a force that pulls objects towards each other?
gravity
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38. Click One Time for Answer
What is the term for forces that are equal in size and opposite in direction?
Balanced forces
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39. Click One Time for Answer
What is the term for forces of pulling and pushing between magnetic poles?
Magnetism
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40. Click One Time for Answer
What is the term for opposing forces where one force is greater than the other?
Unbalanced forces
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41. You are DONE!!!!
If you answered all or most of these questions correctly you should do very well on your Force and Motion Test! Thanks for playing!