Name _______________________________________
Period: 1 2 3 4 5 6 7
2-1 & 2-2 Section Review
Describing Motion and Acceleration
Choose the term from the word list that best completes each statement. Write the term in the blank at the left
of each statement.
average speed
acceleration
distance
displacement
speed
instantaneous speed
average speed
1.
Calculating the total distance divided by the total time
will give the ______________.
displacement
2.
The distance and direction an object moves from its
starting point is _________________.
speed
3.
The distance an object travels per unit of time is
_________________.
velocity
4.
The speed and direction with which an object
moves is its _______________.
distance
5.
________________ is a measure of how far an object has
moved.
acceleration
6.
The rate of change in velocity is ________________.
velocity
Choose the answer that best completes each of the following sentences. Write the letter for that answer on
the line to the left of each question.
________
7.
If you ride your bicycle down a straight road for 500 m then turn around
and ride back, your distance is _____ your displacement.
a.
greater than
c.
less than
b.
equal to
d.
can’t determine
________
8.
Motion is a change in ____________.
a.
time
c.
b.
speed
d.
________
9.
velocity
position
The speed you read on a speedometer is ___________.
a.
instantaneous speed
c.
average speed
b.
constant speed
d.
velocity
________
10.
3 m/s north is an example of a(n) ________.
a.
speed
c.
position
b.
velocity
d.
acceleration
________
11.
The relationship among speed, distance, and time is ________.
a.
t = s/d
c.
s = dt
b.
d = t/s
d.
s = d/t
________
12.
A single point on a distance – time graph tells the ________.
a.
instantaneous speed c.
constant speed
b.
average speed
d.
average velocity
________
13.
A merry-go-round horse moves at a constant speed but at a changing _____.
a.
velocity
c.
inertia
b.
balanced force
d.
unbalanced force
________
14.
If you ride your bike up a hill, then ride down the other side, your
acceleration is _______________.
a.
all positive
c.
first positive, then negative
b.
all negative
d.
first negative, then positive
________
15.
A horizontal line on a velocity/time graph shows _______acceleration.
a.
positive
c.
velocity
b.
negative
d.
zero
Use complete sentences to answer the following questions.
16.
Two cars start at the same point and drive in a straight line for 5 km. At the end of the drive their
distances are the same but their displacements are different. Explain.
The two cars were driving in different directions.
17.
An inline skater is skating around a parking lot. Can she have constant speed and a changing
velocity? Changing speed and constant velocity? Explain your answers.
She can have constant speed and a changing velocity – velocity is speed plus direction, her speed
may not be change, but her direction could be.
She cannot have changing speed and a constant velocity. Velocity is speed plus a direction, so if
speed changes then velocity has to as well.
18.
Explain whether, during a trip, a car’s instantaneous speed can ever be greater than its average
speed.
A car’s instantaneous speed on a trip can be greater than the average speed. On a trip, you may
go through towns as well as be on highways. The speed you go through towns is lower than the speed
on a highway. Therefore, the speed you travel through town brings you average speed down. This
makes your speed on the highway greater than the average speed you have traveled.
19.
Describe the difference between average speed and constant speed.
Average speed is the total distance you have traveled divided by the total time it took you to travel
that distance. Constant speed is keeping the same speed over a given period of time.
20.
Describe three ways to change the velocity of a moving car.
1. speed up
2. slow down
3. change direction
21.
Describe the motion of an object that has an acceleration of 0 m/s 2?
The object is either traveling at a constant speed or is not moving.
22.
A car is driving down a road. Is it possible for its position to be changing and its
acceleration to be zero? Is it possible for its velocity to be changing and its acceleration to be zero?
It is not possible for the position of an object to be changing and the acceleration to be zero.
Acceleration is the change in velocity divided by the change in time. Position changing changes the
velocity, which would then change the acceleration.
It is not possible for the velocity to be changing and the acceleration to be zero. Acceleration is
calculated by taking the change in velocity and dividing it by the time it took for the change to
occur. So if velocity changes, the acceleration changes.
Solve the following problems. SHOW YOUR WORK!
23.
An ant travels 75 cm in 5 s. What was the ant’s speed?
75 cm = 15 cm/s
5s
24.
It took you 6.5 h to drive 55 km. What was your speed?
55 km = 8.5 km/h
6.5 h
25.
If a car travels 300 km north in 4 h, what is its velocity?
300 km = 75 km/h
4h
26.
Find the acceleration of a car that goes from 40 m/s to 96 m/s in 7 seconds.
96 m/s – 40 m/s = 8 m/s2
7s