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Q 1/59
Score 0
Can one-dimensional motion have zero distance but a nonzero displacement? What about zero displacement but a nonzero distance?
30
D. One-dimensional motion cannot have zero distance with a nonzero displacement. Displacement has both magnitude and direction, and it cannot have zero displacement with nonzero distance because distance has only magnitude.
B. One-dimensional motion can have zero distance with a nonzero displacement. Displacement has both magnitude and direction, but it cannot have zero displacement with nonzero distance because distance has only magnitude.
C. One-dimensional motion cannot have zero distance with a nonzero displacement. Displacement has both magnitude and direction, but it can have zero displacement with nonzero distance because distance has only magnitude and any motion will be the distance it moves.
A. One-dimensional motion can have zero distance with a nonzero displacement. Displacement has both magnitude and direction, and it can also have zero displacement with nonzero distance because distance has only magnitude.
Q 2/59
Score 0
In which example would you be correct in describing an object in motion while your friend would also be correct in describing that same object as being at rest?
30
C. You are driving a car toward the east and your friend is standing at the bus stop. In your frame of reference, your friend will be moving toward the west. In your friend’s frame of reference, he will be at rest.
B. You are driving a car toward the east and your friend is standing at the bus stop. In your frame of reference, you will be in motion. In your friend’s frame of reference, you will be at rest.
D. You are driving a car toward the east and your friend is standing at the bus stop. In your frame of reference, your friend will be moving toward the east. In your friend’s frame of reference, he will be at rest.
A. You are driving a car toward the east and your friend drives past you in the opposite direction with the same speed. In your frame of reference, you will be in motion. In your friend’s frame of reference, you will be at rest.
59 questions
Q.
Can one-dimensional motion have zero distance but a nonzero displacement? What about zero displacement but a nonzero distance?
1
30 sec
Q.
In which example would you be correct in describing an object in motion while your friend would also be correct in describing that same object as being at rest?
2
30 sec
Q.
What does your car’s odometer record?
3
30 sec
Q.
In the definition of velocity, what physical quantity is changing over time?
4
30 sec
Q.
Which of the following best describes the relationship between instantaneous velocity and instantaneous speed?
5
30 sec
Q.
Use the graph to describe what the runner’s motion looks like. Figure 2.25 How are average velocity for only the first four seconds and instantaneous velocity related? What is the runner's net displacement over the time shown?
6
30 sec
Q.
A position vs. time graph of a frog swimming across a pond has two distinct straight-line sections. The slope of the first section is 1 m/s. The slope of the second section is 0 m/s. If each section lasts 1 s, then what is the frog’s total average velocity?
7
30 sec
Q.
A graph of velocity vs. time of a ship coming into a harbor is shown below Describe the acceleration of the ship based on the graph.
8
30 sec
Q.
Boat A and Boat B are traveling at a constant speed in opposite directions when they pass each other. If a person in each boat describes motion based on the boat’s own reference frame, will the description by a person in Boat A of Boat B’s motion be the same as the description by a person in Boat B of Boat A’s motion?
9
30 sec
Q.
Passenger A sits inside a moving train and throws a ball vertically upward. How would the motion of the ball be described by a fellow train passenger B and an observer C who is standing on the platform outside the train?
10
30 sec
Q.
Is it possible to determine a car’s instantaneous velocity from just the speedometer reading?
11
30 sec
Q.
Terri, Aaron, and Jamal all walked along straight paths. Terri walked 3.95 km north in 48 min. Aaron walked 2.65 km west in 31 min. Jamal walked 6.50 km south in 81 min. Which of the following correctly ranks the three boys in order from lowest to highest average speed?
12
30 sec
Q.
Rhianna and Logan start at the same point and walk due north. Rhianna walks with an average velocity (v_avg,R) Logan walks three times the distance in twice the time as Rhianna. Which of the following expresses Logan’s average velocity in terms of v_avg,R?
13
30 sec
Q.
Explain how you can use the graph of position vs. time to describe the change in velocity over time. Identify the time (a), (b), (c), (d) or (e) at which at which the instantaneous velocity is greatest, the time at which it is zero, and the time at which it is negative.
14
30 sec
Q.
Identify the time, or times, at which the instantaneous velocity is greatest, and the time, or times, at which it is negative. A sketch of velocity vs. time derived from the figure will aid in arriving at the correct answers.
15
30 sec
Q.
In a coordinate system in which the direction to the right is positive, what are the distance and displacement of a person who walks 35 m to the left, 18 m to the right, and then 26 m to the left?
16
30 sec
Q.
Billy drops a ball from a height of 1 m. The ball bounces back to a height of 0.8 m, then bounces again to a height of 0.5 m, and bounces once more to a height of 0.2 m. Up is the positive direction. What are the total displacement of the ball and the total distance traveled by the ball?
17
30 sec
Q.
You sit in a car that is moving at an average speed of 86.4 km/h. During the 3.3 s that you glance out the window, how far has the car traveled?
18
30 sec
Q.
Using the graph below, what is the average velocity for the whole 10 seconds?
19
30 sec
Q.
A train starts from rest and speeds up for 15 minutes until it reaches a constant velocity of 100 miles/hour. It stays at this speed for half an hour. Then it slows down for another 15 minutes until it is still. Which of the following correctly describes the position vs time graph of the train’s journey?
20
30 sec
Q.
You are characterizing the motion of an object by measuring the location of the object at discrete moments in time. What is the minimum number of data points you would need to estimate the average acceleration of the object?
21
30 sec
Q.
Which option best describes the average acceleration from 40 to 70 s? See the graph below.
22
30 sec
Q.
The graph below shows velocity vs. time. Figure 2.28 Calculate the net displacement using seven different divisions. Calculate it again using two divisions: 0 → 40 s and 40 → 70 s . Compare. Using both, calculate the average velocity.
23
30 sec
Q.
Why should you specify a reference frame when describing motion?
24
30 sec
Q.
Which of the following is true for the displacement of an object?
25
30 sec
Q.
If a biker rides west for 50 miles from his starting position, then turns and bikes back east 80 miles. What is his net displacement?
26
30 sec
Q.
Suppose a train is moving along a track. Is there a single, correct reference frame from which to describe the train’s motion?
27
30 sec
Q.
If a space shuttle orbits Earth once, what is the shuttle’s distance traveled and displacement?
28
30 sec
Q.
Four bicyclists travel different distances and times along a straight path. Which cyclist traveled with the greatest average speed?
29
30 sec
Q.
A car travels with an average velocity of 23 m/s for 82 s. Which of the following could NOT have been the car's displacement?
30
30 sec
Q.
A bicyclist covers the first leg of a journeyu that is d_1 meters long in t_1 seconds, at a speed of v_1 meters per second, and the second leg of d_2 meters in t_2 seconds, at a speed of v_2 meters per second. If his average speed is equal to the average of v_1 and v_2, then which of the following is true?
31
30 sec
Q.
A car is moving on a straight road at a constant speed in a single direction. Which of the following statements is true?
32
30 sec
Q.
What is the slope of a straight line graph of position vs. time?
33
30 sec
Q.
Using the graph below, what is the runner’s velocity from 4 to 10 s?
34
30 sec
Q.
What does the area under a velocity vs. time graph line represent?
35
30 sec
Q.
An object is moving along a straight path with constant acceleration. A velocity vs. time graph starts at 0 and ends at 10 m/s, stretching over a time-span of 15 s. What is the object’s net displacement?
36
30 sec
Q.
While standing on a sidewalk facing the road, you see a bicyclist passing by toward your right. In the reference frame of the bicyclist, in which direction are you moving?
37
30 sec
Q.
Maud sends her bowling ball straight down the center of the lane, getting a strike. The ball is brought back to the holder mechanically. What are the ball’s net displacement and distance traveled?
38
30 sec
Q.
A fly buzzes four and a half times around Kit Yan’s head. The fly ends up on the opposite side from where it started. If the diameter of his head is 14 cm, what is the total distance the fly travels and its total displacement?
39
30 sec
Q.
Rob drove to the nearest hospital with an average speed of v m/s in t seconds. In terms of t, if he drives home on the same path, but with an average speed of 3v m/s, how long is the return trip home?
40
30 sec
Q.
What can you infer from the statement, Velocity of an object is zero?
41
30 sec
Q.
An object has an average speed of 7.4 km/h. Which of the following describes two ways you could increase the average speed of the object to 14.8 km/h?
42
30 sec
Q.
Swimming one lap in a pool is defined as going across a pool and back again. If a swimmer swims 3 laps in 9 minutes, how can his average velocity be zero?
43
30 sec
Q.
A hockey puck is shot down the arena in a straight line. Assume it does not slow until it is stopped by an opposing player who sends it back in the direction it came. The players are 20 m apart and it takes 1 s for the puck to go there and back. Which of the following describes the graph of the displacement over time? Consider the initial direction of the puck to be positive.
44
30 sec
Q.
A defensive player kicks a soccer ball 20 m back to her own goalie. It stops just as it reaches her. She sends it back to the player. Without knowing the time it takes, draw a rough sketch of the displacement over time. Does this graph look similar to the graph of the hockey puck from the previous question?
45
30 sec
Q.
What are the net displacement, total distance traveled, and total average velocity in the previous two problems?
46
30 sec
Q.
A bee flies straight at someone and then back to its hive along the same path. Assuming it takes no time for the bee to speed up or slow down, except at the moment it changes direction, how would the graph of position vs time look? Consider the initial direction to be positive.
47
30 sec
Q.
What would the velocity vs. time graph of the object whose position is shown in the graph below look like?
48
30 sec
Q.
Which statement correctly describes the object’s speed, as well as what a graph of acceleration vs. time would look like? See graph below
49
30 sec
Q.
Calculate that object’s net displacement over the time shown in the graph below.
50
30 sec
Q.
What is the object’s average velocity?
51
30 sec
Q.
Find the distance traveled from the starting point for each path. Which path has the maximum distance?
52
30 sec
Q.
Alan starts from his home and walks 1.3 km east to the library. He walks an additional 0.68 km east to a music store. From there, he walks 1.1 km north to a friend’s house and an additional 0.42 km north to a grocery store before he finally returns home along the same path. What is his final displacement and total distance traveled?
53
30 sec
Q.
Two runners start at the same point and jog at a constant speed along a straight path. Runner A starts at time t = 0 s, and Runner B starts at time t = 2.5 s. The runners both reach a distance 64 m from the starting point at time t = 25 s. If the runners continue at the same speeds, how far from the starting point will each be at time t = 45 s?
54
30 sec
Q.
A father and his daughter go to the bus stop that is located 75 m from their front door. The father walks in a straight line while his daughter runs along a varied path. Despite the different paths, they both end up at the bus stop at the same time. The father’s average speed is 2.2 m/s, and his daughter’s average speed is 3.5 m/s. (a) How long does it take the father and daughter to reach the bus stop? (b) What was the daughter’s total distance traveled? (c) If the daughter maintained her same average speed and traveled in a straight line like her father, how far beyond the bus stop would she have traveled?
55
30 sec
Q.
What kind of motion would create a position graph like the one shown? See the graph below
56
30 sec
Q.
What is the average velocity for the whole time period shown in the graph below?
57
30 sec
Q.
Consider the motion of the object whose velocity is charted in the graph below. During which points is the object slowing down and speeding up?
58
30 sec
Q.
Divide the graph into approximate sections, and use those sections to graph the velocity vs. time of the object. Then calculate the acceleration during each section, and calculate the approximate average velocity.
