Focus On Physical Science: California Grade 8

Lesson 2: Speed, Velocity, and Acceleration

Standards Check

1.
__________ is the speed of an object at any instant of time. 1.b
A)Velocity
B)Acceleration
C)Instantaneous speed
D)Average speed
2.
A bicycle rider travels 15 km in 1.25 hours. What is the rider's average speed? 1.c
A)13.75 km/h
B)12 km/h
C)22.5 km/h
D)10.5 km/h
3.
__________ is displacement divided by the time. 1.d
A)Position
B)Speed
C)Acceleration
D)Velocity
4.
What is the term for a change in velocity? 1.e
A)acceleration
B)speed
C)instantaneous speed
D)average speed
5.
__________ is distance divided by time. 1.b
A)Acceleration
B)Displacement
C)Velocity
D)Speed
6.
An object that travels 100 m in 20 s has what speed? 1.b
A)200 m/s
B)5 m/s
C)2000 m/s
D)50 m/s
7.
The __________ measures the speed during an entire trip. 1.b
A)average speed
B)acceleration
C)instantaneous speed
D)overall speed
8.
At the beginning of a track race, the instantaneous speed of all runners is __________. 1.b
A)different
B)the average speed
C)unable to be measured
D)0 m/s
9.
When a car goes around a curve at 20 mph, the __________ changes. 1.d
A)average speed
B)instantaneous speed
C)velocity
D)average speed
10.
When something accelerates then stops accelerating, what happens to the object? 1.e
A)slows
B)continues to move at a constant velocity
C)goes faster
D)stops completely
11.
An object that has the same speed but changes direction is __________. 1.e
A)displacing
B)speeding
C)slowing down
D)accelerating
12.
__________ is the change in velocity divided by the time needed for the change to occur. 1.e
A)Displacement
B)Speed
C)Acceleration
D)Average velocity
13.
Which of the following statements is true? 1.e
A)An object does not accelerate if it turns and maintains constant speed.
B)If a moving object slows, it is accelerating.
C)Velocity of a moving object is the distance traveled divided by the time needed to travel the distance.
D)When speed increases gradually, average speed and instantaneous speed are the same.
Grade 8
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