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F & M Chp 1 Motion

Modified True/False
Indicate whether the sentence or statement is true or false.
 

1. 
Motion is measured relative to a reference point.

 

2. 
A cyclist travels 20 km in half an hour. Her average speed is 10 km/h.

 

3. 
If a toy car traveling at 10 cm/s passes a toy car moving at 10 cm/s in the opposite direction, both cars have the same velocity.

 

4. 
A straight line on a motion graph indicates constant speed.

 

5. 
A slanted line on a motion graph means that the object is at rest.

 

6. 
The upper layer of Earth is broken into more than a dozen continents that move very slowly in various directions.

 

7. 
A child riding on a merry-go-round is accelerating because his direction is changing.

 

8. 
The SI unit of velocity is the meter per second per second.

 

9. 
A straight line on a graph of speed versus time means that the object has a constant acceleration.

 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

10. 
When an object’s distance from another object is changing,
a.
it is in motion.
b.
it is speeding.
c.
it has a high velocity.
d.
it is accelerating.
 

11. 
The basic SI unit of length is the
a.
meter.
b.
foot.
c.
inch.
d.
mile.
 

12. 
Speed equals distance divided by
a.
time.
b.
velocity.
c.
size.
d.
motion.
 

13. 
When you know both the speed and direction of an object’s motion, you know the
a.
average speed of the object.
b.
acceleration of the object.
c.
distance the object has traveled.
d.
velocity of the object.
 

14. 
You can show the motion of an object on a line graph in which you plot distance against
a.
velocity.
b.
time.
c.
speed.
d.
direction.
 

15. 
In graphing motion, the steepness of the slope depends on
a.
how quickly or slowly the object is moving.
b.
how far the object has moved.
c.
the velocity of the object.
d.
the direction the object is moving.
 

16. 
The upper layer of Earth consists of more than a dozen major pieces called
a.
units.
b.
plates.
c.
continents.
d.
tectonics.
 

17. 
The rate at which velocity changes is called
a.
speed.
b.
direction.
c.
acceleration.
d.
motion.
 

18. 
Which of these is an example of deceleration?
a.
a bird taking off for flight
b.
a car driving from a green light
c.
a car approaching a red light
d.
an airplane turning to change its course
 

19. 
To determine the acceleration rate of an object, you must calculate the change in velocity during each unit of
a.
speed.
b.
time.
c.
motion.
d.
deceleration.
 

20. 
If velocity is measured in kilometers per hour and time is measured in hours, the unit of acceleration is
a.
hours.
b.
kilometers per hour.
c.
kilometers per hour per hour.
d.
kilometers.
 

21. 
A train that travels 100 kilometers in 4 hours is traveling at what average speed?
a.
50 km/h
b.
100 km/h
c.
2 km/h
d.
25 km/h
 

22. 
A place or object used for comparison to determine if something is in motion is called
a.
a position.
b.
a reference point.
c.
a constant.
d.
velocity.
 

23. 
Gallons, inches, and pounds are all
a.
distances.
b.
reference points.
c.
units.
d.
velocities.
 

24. 
On a graph showing distance versus time, a horizontal line represents an object that is
a.
moving at a constant speed.
b.
increasing its speed.
c.
decreasing its speed.
d.
not moving at all.
 

25. 
The International System of Units is used
a.
only in the United States.
b.
only in France.
c.
in most of Europe.
d.
all over the world.
 

26. 
According to the theory of plate tectonics,
a.
Earth’s crust is made of molten lava.
b.
Earth’s plates move ever so slowly.
c.
Earth’s surface has not changed over time.
d.
Earth’s core is magnetic.
 

27. 
If you know the distance an object has traveled in a certain amount of time, you can determine
a.
the size of the object.
b.
the speed of the object.
c.
the location of the object.
d.
the velocity of the object.
 

28. 
It is rare for any motion to
a.
stay the same for very long.
b.
change quickly.
c.
increase in velocity.
d.
decrease in speed.
 

29. 
If the speed of an object does NOT change, the object is traveling at a
a.
constant speed.
b.
average speed.
c.
increasing speed.
d.
decreasing speed.
 

30. 
Changing direction is an example of a kind of
a.
acceleration.
b.
speed.
c.
velocity.
d.
constant rate.
 

31. 
If a bicyclist travels 30 kilometers in two hours, her average speed would be
a.
30 km/h.
b.
60 km/h.
c.
15 km/h.
d.
2 km/h.
 

32. 
The moon accelerates because it is
a.
in a vacuum in space.
b.
continuously changing direction.
c.
a very large sphere.
d.
constantly increasing its speed of orbit.
 

33. 
If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?
a.
The object’s speed changed during the 4 hours.
b.
The object’s speed and average speed were equal during the entire 4 hours.
c.
The object accelerated during the 4 hours.
d.
The object decelerated during the 4 hours.
 

34. 
If you know a car traveled 300 kilometers in 3 hours, you can find its
a.
acceleration.
b.
direction.
c.
average speed.
d.
velocity.
 

35. 
In an acceleration graph showing speed versus time, a straight line shows the acceleration is
a.
decreasing.
b.
increasing.
c.
changing.
d.
constant.
 

Completion
Complete each sentence or statement.
Word Bank
slope            meter          0.5m/s^2             stationary        accelerates     
south              speed                   velocity               constant              
km/h                    crust                       negative                     motion    
bicycle           m/s^2              km/h             tectonics           deceleration   
lower                   meter
 

36. 
A reference point is assumed to be ____________________, or not moving.
 

 

37. 
A change in an object’s position relative to a reference point is called ____________________.
 

 

38. 
When riding a bicycle past a building, you are not moving relative to the ____________________.
 

 

39. 
Suppose you are standing on a corner when a car moving toward the north passes you. If you use the car as a reference point, the direction in which you appear to be moving is toward the ____________________.
 

 

40. 
The distance traveled by a moving object per unit of time is called ____________________.
 

 

41. 
The basic SI unit of length is the ____________________.
 

 

42. 
Speed that does not change is referred to as ____________________ speed.
 

 

43. 
The statement that the motion of a hurricane is 20 kilometers per hour in an easterly direction is a description of the hurricane’s ____________________.
 

 

44. 
A speed of 15 kilometers per hour is abbreviated as 15 ____________________.
 

 

45. 
According to the theory of plate ____________________, Earth’s plates move very slowly in various directions.
 

 

46. 
The boundaries between the plates that make up the upper layer of Earth are cracks in Earth’s ____________________.
 

 

47. 
Acceleration is the rate of change in ____________________.
 

 

48. 
____________________ occurs when an object slows down.
 

 

49. 
A golf ball ____________________ when either its speed or direction changes.
 

 

50. 
The motion of a car stopping at a traffic light is an example of a ____________________ acceleration, also called deceleration.
 

 

51. 
The abbreviation of the unit of acceleration (meters per second per second) is ____________________.
 

 

52. 
If a ship has an acceleration of 3 km/h2, its speed is expressed in the unit ____________________.
 

 

53. 
If a car is speeding up, its initial speed is ____________________ than its final speed.
 

 

54. 
If a train traveling north at 30 m/s brakes to a stop in 1 minute, its acceleration is ____________________ southward.
 

 

55. 
If two lines appear on the same motion graph, the line with the steeper ____________________ indicates a greater speed.
 

 



 
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