Focus On Physical Science: California Grade 8

Chapter 1: Motion

Standards Review

1.
Which does not define a reference direction relative to a reference point? 1.a
A)left
B)in front of
C)away from
D)+5 cm
2.
Which is not needed to describe an object's position? 1.a
A)reference direction
B)reference point
C)velocity
D)distance from reference point
3.
The length of an arrow representing a velocity vector depends on the object's ______. 1.d
A)speed
B)acceleration
C)position
D)direction
4.
A speedometer measures a car's _______. 1.b
A)average speed
B)instantaneous speed
C)velocity
D)acceleration
5.
What is your speed if you traveled a distance of 5 km in 0.25 hours? 1.c
A)1.25 km/h
B)5 km/h
C)20 km/h
D)0.05 km/h
6.
How long does it take a car traveling with an average speed of 60 km/h to travel 390 km? 1.c
A)0.15 h
B)6.5 h
C)2.34 h
D)0.65 h
7.
How long will it take a runner to run a 400 m race if the runner's average speed is 8 m/s? 1.c
A)50 s
B)5 h
C)20 s
D)3,200 s
8.
What is equal to the total distance traveled divided by the total time elapsed? 1.b
A)instantaneous speed
B)average speed
C)velocity
D)acceleration
9.
When an object is speeding up, the acceleration vector is _______. 1.e
A)is perpendicular to the velocity vector
B)is in the direction opposite to the velocity vector
C)in the same direction as the velocity vector
D)can be in any direction
10.
To specify an object's velocity, ______ must be given. 1.d
A)the acceleration and direction of motion
B)the acceleration and speed
C)the speed
D)the speed and direction of motion
11.
The slope of a line on a speed-time graph is equal to the _______ of an object. 1.f
A)velocity
B)acceleration
C)speed
D)position
12.
How is an object moving if the line plotted on a speed-time graph curves upward? 1.f
A)It is slowing down.
B)It is speeding up.
C)Its speed is constant.
D)It is at rest.
13.
How is an object moving if the line plotted on a position-time graph is a straight line sloping upward? 1.f
A)It is slowing down.
B)It is speeding up.
C)It is moving with constant speed
D)It is accelerating.
14.
What is an object's acceleration? 1.e
A)The rate of change of displacement with time.
B)The rate of change of distance with time.
C)The rate of change of position with time.
D)The rate of change of velocity with time.
15.
For which situation is the velocity constant? 1.e
A)An object moving in a straight line speeds up.
B)An object turns at a constant speed.
C)An object moves in a straight line with constant speed.
D)An object moves in a circular path.
Grade 8
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