Distance is a measure of length. What information does displacement give in addition to distance?
Question 21
21.
What types of changes in motion cause acceleration?
Question 22
22.
During a race, a runner runs at a speed of 6 m/s. Four seconds later, she is running at a speed of 10 m/s. What is the runner's acceleration? Show your work and please circle your answer.
Question 23
23.
If you ride your bike at an average speed of 2 km/h and need to travel a total distance of 20 km, how long will it take you to reach your destination? Show your work and please circle your answer.
Question 24
24.
A girl walks from her home to a friend's home 3 kilometers north. She then walks east 2 km to the post office, 1 km north to the library, and 1 km east to the park. From the park, she walks 2 km west to the movie theater. After the movie, she walks 4 km south to the pet store.
a. What is the girl's displacement from her starting point to the pet store?
b. Calculate the distance she walked in kilometers.
Question 25
25.
Which graph in Figure 11-2 shows periods of constant speed? Explain your answer.
Question 26
26.
Look at Figure 11-2. Describe the motion of the object in Graph A?
Question 27
27.
Which graph in Figure 11-2 shows acceleration? How do you know?
Question 28
28.
Using Graph A in Figure 11-2, calculate the average speed of the object in motion from 12 s to 20 s. Show your work and please circle your answer.
Question 29
29.
Figure 11-3B illustrates the displacement of an object moving in a plane. Explain what information is provided by arrows A and B.
Question 30
30.
Using vector addition, for the object represented in Figure 11-3B, calculate
a. the distance traveled by the object and
b. the displacement of the object.
Which of the following would reduce the resistance of a metal wire?
increasing its thickness
increasing its temperature
increasing its length
all of the above
A region that has a large number of atoms whose magnetic fields are lined up parallel to a magnet's field is
the magnetosphere.
the magnetic declination.
a magnetic domain.
a ferromagnetic region.
Which wave causes the medium to vibrate only in a direction parallel to the wave's motion?
a transverse wave
a surface wave
a longitudinal wave
none of the above
A passenger in the rear seat of a car moving at a steady speed is at rest relative to
the side of the road.
a pedestrian on the corner ahead.
the front seat of the car.
the wheels of the car.
Which distance can be most accurately measured with a ruler?
the length of a river
the width of a book
the distance between two cities
the size of an object under a microscope
A person walks 1 mile every day for exercise, leaving her front porch at 9:00 AM and returning to her front porch at 9:25 AM. What is the total displacement of her daily walk?
1 mile
0 mile
25 minutes
none of the above
A person drives north 3 blocks, then turns east and drives 3 blocks. The driver then turns south and drives 3 blocks. How could the driver have made the distance shorter while maintaining the same displacement?
by driving east 3 blocks from the starting point
by driving north 1 block and east 4 blocks
by driving west 3 blocks from the starting point
by driving back to the starting point by the same route
A ball is rolled uphill a distance of 3 meters before it slows, stops, and begins to roll back. The ball rolls downhill 6 meters before coming to rest against a tree. What is the magnitude of the ball's displacement?
3 meters
6 meters
9 meters
18 meters
Speed is the ratio of the distance an object moves to
the amount of time needed to travel the distance.
the direction the object moves.
the displacement of the object.
the motion of the object.
Instantaneous speed is measured
at the starting point.
when the object reaches its destination.
at a particular instant.
over the duration of the trip.
A car traveled 88 km in 1 hour, 90 km in the next 2 hours, and then 76 km in 1 hour before reaching its destination. What was the car's average speed?
254 km/h
63.5 km/h
209 km/h
74.5 km/h
A horizontal line on a distance-time graph means the object is
moving at a constant speed.
moving faster.
slowing down.
at rest.
What is the speed of a bobsled whose distance-time graph indicates that it traveled 100 m in 25 s?
4 m/s
250 m/s
0.25 mph
100 m/s
The rate at which velocity changes is called
speed.
vectors.
acceleration.
motion.
Which example identifies a change in motion that produces acceleration?
a speed skater moving at a constant speed on a straight track
a ball moving at a constant speed around a circular track
a particle moving in a vacuum at a constant velocity
a vehicle moving down the street at a stead speed
Objects in free fall near the surface of the Earth experience
constant speed
constant velocity
constant acceleration
constant distance
Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 2 s. What is your acceleration?
1 m/s2
2 m/s2
4 m/s2
6 m/s2
An object moving at 30 m/s takes 5 s to come to a stop. What is the object's acceleration?
