1. STANDARD 1a
Students know position is defined in relation to some choice of a standard reference point and a set of reference directions

2. MOTION
The position of an object is defined by a direction and distance from a reference point
A reference point is a place or object used for comparison to define where something is.
Objects that don’t move make good reference points
An object is in motion if it changes position in relation to a reference point

3. MOTION 83. Which object would make the best reference point?
A a flagpole
B a mountain bike during a race
C a bird in flight
D a car moving slowly on the highway
ANSWER: A

4. STANDARD 1b
Students know that average speed is the total distance traveled divided by the total time elapsed and that the speed of an object along the path traveled can vary

5. That’s right-it’s traveling at 50 m/s
MOTION
Speed-amount of distance covered in a certain time
100 meters
2 seconds
That’s right-it’s traveling at 50 m/s
If the car covers a distance of 100 meters in 2 seconds what is its speed in m/s ?

6. MOTION
85. A truck traveled 180 km in 3 hours. What was the truck’s average speed?
A 18 km/hr
B 3 km/hr
C 15 km/hr
D km/hr
ANSWER: D

7. MOTION
86. What is the average speed of the object over the time interval 4 s to 8 s?
A m/s
B m/s
C m/s
D m/s
ANSWER: C

8. MOTION
87. If a horse walked 50 m in 68 s, cantered 150 m in 35 s, and galloped 300 m in 22 s, what would its average speed be?
A m/s
B 4 m/s
C m/s
D m/s
ANSWER: B

9. STANDARD 1c
Students know how to solve problems involving distance, time, and average speed

10. MOTION To find average speed of an object use: v = d/t
velocity = distance divided by time
To find distance traveled by an object use:
d = vt
distance = velocity times time
To find time elapsed during the motion of an object use:
t = d/v
time = distance divided by velocity

11. MOTION
89. What is the time required for a cheetah to travel a distance of 120 m at an average speed of 3 m/s?
A 360 s
B 123 s
C 40 s
D 10 s
ANSWER: C

12. MOTION
90. Kyle needs to determine the distance a car traveled given the car’s average speed and the time it took the car to travel the distance. What equation should Kyle use to determine distance?
A d = vt
B v = d/t
C d = t/v
D t = d/v
ANSWER: A

13. STANDARD 1d
Students know the velocity of an object must be described by specifying both the direction and the speed of the object

14. MOTION Velocity is speed in a given direction
40 miles per hour NORTH is a velocity because it indicates both speed and direction.
Velocity is a vector because it has both magnitude and a direction
The magnitude of the velocity vector is the speed

15. MOTION 91. What is a description of velocity? A 50 km/h B 50 km/h west
C 50 km west
D 50 km
ANSWER: B

16. STANDARD 1e
Students know changes in velocity may be due to changes in speed, direction, or both

17. MOTION
An object changes its velocity if it changes its speed, its direction, or both
Acceleration is the rate at which velocity changes with time
Acceleration refers to increasing speed, decreasing speed, or changing direction

18. MOTION
92. A baseball pitcher throws a pitch that curves over the plate at a speed of 100 km/hr. The velocity of the baseball changed because the baseball
A slowed down over home plate
B never changed direction
C could not be hit by the batter
D changed direction during its motion
ANSWER: D

19. MOTION
94. As a ball rolls down a hill, what happens to its speed and its acceleration?
A speed and acceleration both increase
B speed and acceleration both decrease
C speed increases and acceleration stays constant
D speed decreases and acceleration increases
ANSWER: C

20. MOTION
95. An object that is moving at a constant speed will be accelerating if it is
A moving in a straight line
B moving in a curved line
C moving away from you
D moving toward you
ANSWER: B

21. STANDARD 1f
Students know how to interpret graphs of position versus time and graphs of speed versus time for motion in a single direction

22. GRAPHING MOTION
CONSTANT SPEED
Distance vs Time
Velocity vs Time

23. CHANGING VELOCITY (ACCELERATION)
GRAPHING MOTION
CHANGING VELOCITY (ACCELERATION)
Distance vs Time
Velocity vs Time
The distance you travel each second becomes longer and longer
Plotting the velocity against time results in a positive slope

24. CHANGING VELOCITY (DECELERATION)
GRAPHING MOTION
CHANGING VELOCITY (DECELERATION)
Distance vs Time
Velocity vs Time

25. Forces and Motion
96. Over which time interval did the object accelerate?
a. 2 s to 4 s
b. 4 s to 6 s
c. 6 s to 8 s
d. 8 s to 10 s
ANSWER: B

26. Forces and Motion
97. Over what time interval is the speed of the object constant?
a. 0 s to 1 s
b. 1 s to 2 s
c. 2 s to 3 s
d. 4 s to 5 s
ANSWER: C

27. Forces and Motion 98. What is the speed of the car? A 1 km/min
B 6 km/min
C 10 km/min
D 60 km/min
ANSWER: A

28. Forces and Motion
100. What is the speed of the object during the time interval from 2 seconds to 5 seconds?
A 0 m/s
B 3 m/s
C 12 m/s
D 30 m/s
ANSWER: A

29. MOTION
101. The graph represents the motion of an object. The slanted, straight line on the graph indicates that
A the object is traveling at a constant speed
B the object is not accelerating
C the object is accelerating at a constant rate
D the object is accelerating at an ever increasing rate
ANSWER: C