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Science 9 Chp. 11 Practice Quiz

Total questions: 116

Worksheet time: 6hrs 48mins

Name
Class
Date
1.
An airplane is flying at 635 km per hour at an altitude of 35,000 m. It is currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is its velocity?
a)
635 km/h
b)
16 m/min
c)
35 000 m/s
d)
This cannot be determined without further information about its direction.
2.

The SI unit for speed is

a)

mph.

b)

ft/s2.

c)

m/s.

d)

Δv / t.

3.
On a speed-time graph, a line with a negative slope indicates that the object is
a)
speeding up.
b)
slowing down.
c)
not moving.
d)
traveling at a constant speed.
4.
The combination of all of the forces acting on an object is called the
a)
total force.
b)
union of forces.
c)
super force.
d)
net force.
5.
If the net force acting on a stationary object is zero, then the object will
a)
accelerate in the direction of the strongest force.
b)
remain at rest.
c)
begin moving backwards.
d)
decelerate at a steady rate of speed.
6.
If the net force on an object is zero then the object has
a)
reaction forces.
b)
action forces.
c)
balanced forces.
d)
unbalanced forces.
7.
A tug-of-war that results in one team pulling the other across the line is an example of
a)
action forces.
b)
reaction forces.
c)
balanced forces.
d)
unbalanced forces.
8.
Which of the following best illustrates balanced forces?
a)
a rock falling to the ground
b)
a stretched rubber band being held between two hands
c)
a person lifting a heavy box off of the ground
d)
a crash between a large truck and a train
9.
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?
a)
The mass of the object has increased.
b)
Gravity on the object has increased.
c)
The object is experiencing some kind of friction.
d)
The momentum of the object has reached a maximum.
10.
Which of the following statements is true?
a)
Frictional forces are greatest when both surfaces are rough.
b)
When a truck is parked on a hill, friction pulls the truck down the hill.
c)
Air resistance always opposes friction.
d)
Friction can exist between two objects even when they are not in contact.
11.
An object is in motion when
a)
you observe the object move.
b)
the object’s speed increases.
c)
the object’s displacement is greater than the distance traveled.
d)
the object changes position relative to a stationary reference point.
12.

Which straight-line acceleration indicates an increase in speed?

a)

0 m/s2

b)

-15 m/s2

c)

4 m/s2

d)

All of the above

13.
Which of the following speeds is the most accurate?
a)
100 miles per day
b)
100 miles per hour
c)
100 miles per minute
d)
100 miles per second
14.
How can the friction on a water slide be reduced?
a)
warm the surface of the slide
b)
keep the surface of the slide dry
c)
run a constant stream of water down the slide
d)
increase the slope of the slide
15.
Which is an example of balanced forces acting on an object?
a)
a kangaroo jumping
b)
a car turning a corner
c)
a cyclist slowing down
d)
a leaf lying on the grass
16.
A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?
a)
equal to the force pulling the car downhill
b)
greater than the force pulling the car downhill
c)
greater than the force pulling the car uphill
d)
smaller than the force pulling the car uphill
17.
An object that changes position relative to a reference point is
a)
stationary.
b)
in motion.
c)
moving at constant speed.
d)
moving at constant velocity.
18.
Average speed can be represented by the mathematical expression
a)
distance/time.
b)
distance ? time.
c)
time – distance.
d)
time + distance.
19.
The _____ of an object consists of its speed and direction.
a)
velocity
b)
instantaneous speed
c)
average speed
d)
displacement
20.
The average speed of a runner who runs 500.0 m in 1.6 min is
a)
0.19 m/s.
b)
5.2 m/s.
c)
96 m/s.
d)
312 m/s.
21.
A car moving at an average speed of 55.0 mi/h for 4.25 h has traveled
a)
0.08 mi.
b)
13 mi.
c)
55 mi.
d)
234 mi.
22.
On a distance vs. time graph of an object’s motion, distance is usually
a)
plotted on the x-axis.
b)
greater than time.
c)
the dependent variable.
d)
measured in ft/min.
23.
A pitcher throws a baseball to home plate, a distance of 60.5 ft. The ball reaches home plate in 0.63 s. What is the velocity of the ball?
a)
38 ft/s
b)
38 ft/s toward home plate
c)
96 ft/s
d)
96 ft/s toward home plate
24.
When the motion of an object is shown by a straight line on a distance vs. time graph with distance on the y-axis, the slope of the line is the
a)
distance traveled.
b)
displacement.
c)
speed.
d)
time of travel.
25.
On a bus traveling north at 20.0 m/s, a child stands up and walks toward the back of the bus at 1.3 m/s. What is the child’s resultant velocity?
a)
18.7 m/s north
b)
18.7 m/s south
c)
21.3 m/s north
d)
21.3 m/s south
26.
Displacement must always indicate
a)
velocity.
b)
direction.
c)
speed.
d)
time.
27.
Speeding up, slowing down, and changing direction is best described as
a)
velocity.
b)
distance.
c)
displacement.
d)
acceleration.
28.
When centripetal acceleration occurs, an object
a)
speeds up.
b)
slows down.
c)
changes direction.
d)
is stationary.
29.
The equation for finding average acceleration for straight-line motion is
a)
initial velocity – final velocity ? time.
b)
final velocity – initial velocity/time.
c)
initial velocity + final velocity + time.
d)
initial velocity + final velocity – time.
30.

Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of

a)

0.32 m/s.

b)

0.32 m/s2.

c)

3.1 m/s.

d)

3.1 m/s2.

31.

A cyclist is traveling at an initial speed of 10.0 m/s. She accelerates at a rate of 0.500 m/s2. What is her final speed after 9.0 s?

a)

14.5 m/s

b)

14.5 m/s2

c)

5.5 m/s

d)

5.5 m/s2

32.
Peter runs in a constant direction on a straight road. The velocity vs. time graph of Peter’s motion shows a straight line with a negative slope. What does the line tell you about Peter’s speed?
a)
It is increasing.
b)
It is decreasing.
c)
It is decreasing, then increasing.
d)
It is constant.
33.
When velocity changes by the same amount over each time interval, acceleration is
a)
zero.
b)
constant.
c)
positive.
d)
negative.
34.
On a velocity vs. time graph, what shows the value of the acceleration?
a)
the slope of the line
b)
the x-axis
c)
the y-axis
d)
the final velocity
35.

A cheetah can accelerate at up to 6.0 m/s2. How long does it take for a cheetah to speed up from 10.5 m/s to 12.2 m/s?

a)

0.28 s

b)

1.7 s

c)

3.5 s

d)

10 s

36.
What happens when a car slows down and velocity changes?
a)
positive acceleration
b)
resultant acceleration
c)
negative acceleration
d)
constant acceleration
37.
Net force is
a)
the force acting in the same direction as an object’s movement.
b)
the force acting in the opposite direction of an object’s movement.
c)
the combination of all the forces acting on an object.
d)
the force of gravity pulling an object down.
38.
An object experiencing balanced forces
a)
has a net force of zero.
b)
is speeding up.
c)
is slowing down.
d)
stops moving.
39.
A game of tug-of-war is an example of
a)
rolling friction.
b)
air resistance.
c)
streamlining.
d)
unbalanced forces.
40.
Which is an example of static friction?
a)
pulling a skier behind a boat
b)
pushing a box that is at rest
c)
braking a car going down a hill
d)
driving a car up a hill
41.
Which is not an example of sliding friction?
a)
ice skating on a frozen pond
b)
taking notes with a pencil
c)
rolling a ball across a desk
d)
pushing a book across a table
42.
In order to increase a car’s speed, the force pushing it forward must be
a)
a negative force.
b)
rolling friction.
c)
fundamental friction.
d)
kinetic friction.
43.
The friction between objects that are stationary is called
a)
static friction.
b)
rolling friction.
c)
fundamental friction.
d)
kinetic friction.
44.
Which is an example of helpful friction?
a)
wearing batting gloves
b)
sprinkling sand on an icy road
c)
applying the brakes on a car
d)
All of the above
45.
Which of the following requires friction?
a)
cleaning a pan
b)
writing a letter
c)
skiing
d)
All of the above
46.
Using lubricants on engine parts is an example of reducing
a)
force.
b)
friction.
c)
acceleration.
d)
motion.
47.
The distance traveled by an object divided by the time it takes to travel that distance is called
a)
average velocity.
b)
average speed.
c)
average acceleration.
d)
negative acceleration.
48.
On a distance vs. time graph, the line of an object at rest is a
a)
curved line with a slope of zero.
b)
flat line with a slope of zero.
c)
jagged line with a negative slope.
d)
curved line with a positive slope.
49.
The difference between speed and velocity is that velocity includes
a)
direction.
b)
distance.
c)
time.
d)
weight.
50.
An example of helpful friction is
a)
car tires wearing out.
b)
getting holes in your socks.
c)
writing on paper with a pen.
d)
scraping your knee on the floor.
51.
Friction is defined as the
a)
force that opposes motion between two surfaces that are touching.
b)
rate at which velocity changes.
c)
resistance of an object to a change in its velocity.
d)
speed of an object in a particular direction.
52.
An object is in motion when
a)
the net force acting on the object is zero.
b)
friction occurs.
c)
the object’s displacement is greater than the distance traveled.
d)
the object changes position relative to a frame of reference.
53.
Force is a quantity made up of
a)
weight and speed.
b)
magnitude and direction.
c)
time and acceleration.
d)
mass and velocity.
54.
Which is an example of balanced forces acting on an object?
a)
a kangaroo jumping
b)
a car turning a corner
c)

a person sitting in a chair

d)
a person pushing a sofa
55.
Acceleration is defined as the change in velocity divided by
a)
speed.
b)
final velocity.
c)
time.
d)
distance.
56.
Which is an example of kinetic friction?
a)
friction between a car’s windshield and the air as you drive into the wind
b)
friction between your shoes and the ground when you stand still
c)
friction between a sticky note and the page of a book as it marks your place
d)
friction between your skin and a pencil as it rests in your palm
57.
In order to determine speed, you must know
a)
only time.
b)
only distance.
c)
both time and distance.
d)
neither time nor distance.
58.
Which of the following does not indicate velocity?
a)
14 ft/s SSE
b)
40 mi/h toward the town square along the main street
c)
80 km/h going from New York toward New Jersey
d)
28 miles from Los Angeles to Catalina Island
59.
When an object slows down, its acceleration is
a)
positive.
b)
centripetal.
c)
negative.
d)
constant.
60.
If the net force acting on a stationary object is zero, then the object will
a)
accelerate in the direction of the strongest force.
b)
remain at rest.
c)
begin moving backwards.
d)
decelerate at a steady rate of speed.
61.
Displacement
a)
must be in a particular direction.
b)
is the change in position of an object.
c)
must be a straight line.
d)
All of the above
62.
The force of gravity, the electromagnetic force, the strong nuclear force, and the weak nuclear force are considered
a)
centripetal forces.
b)
frames of reference.
c)
resultant forces.
d)
fundamental forces.
63.
On a speed vs. time graph, constant acceleration is represented by a
a)
straight line.
b)
slightly sloped line.
c)
jagged line.
d)
steeply sloped line.
64.
The friction between the bristles of your toothbrush and the surfaces of your teeth is an example of
a)
rolling friction.
b)
static friction.
c)
helpful friction.
d)
All of the above
65.

Which term describes an object's change in position relative to a reference point?

a)

Motion

b)

Displacement

c)

Velocity

d)

Speed

66.

What is a frame of reference?

a)

A system for specifying the precise location of objects in space and time

b)

The speed of an object in a particular direction

c)

The change in position of an object

d)

The distance traveled divided by time

67.

Which of the following measures the path taken by an object?

a)

Distance

b)

Displacement

c)

Velocity

d)

Speed

68.

Displacement always includes which of the following?

a)

Direction

b)

Speed

c)

Time

d)

Reference point

69.

What is the difference between speed and velocity?

a)

Speed is how fast an object moves; velocity is speed with direction

b)

Speed is the change in position; velocity is the path taken

c)

Speed is measured in meters; velocity is measured in seconds

d)

Speed is always greater than velocity

70.

How is speed calculated?

a)

Distance traveled divided by the time interval during which the motion occurred

b)

Change in position divided by direction

c)

Time interval divided by distance traveled

d)

Speed multiplied by velocity

71.

Velocity is described relative to what?

a)

A reference point

b)

The object's mass

c)

The object's acceleration

d)

The object's displacement

72.

If an object moves in a particular direction, which term best describes its motion?

a)

Velocity

b)

Speed

c)

Displacement

d)

Distance

73.

A student observes an object changing position with respect to a frame of reference. What can the student conclude?

a)

The object is in motion

b)

The object is at rest

c)

The object is accelerating

d)

The object is stationary

74.

Why is a frame of reference important when describing motion?

a)

It specifies the precise location of objects in space and time

b)

It measures the speed of an object

c)

It determines the mass of an object

d)

It calculates the displacement of an object

75.

Which direction is usually considered positive by convention?

a)

Up and right

b)

Down and left

c)

Up and left

d)

Down and right

76.

What two quantities must you measure to calculate the speed of an object?

a)

Distance traveled and time taken

b)

Mass and volume

c)

Force and acceleration

d)

Temperature and pressure

77.

What is the formula for average speed?

a)

Distance divided by time

b)

Time divided by distance

c)

Distance multiplied by time

d)

Speed multiplied by time

78.

What is the SI unit for speed?

a)

Meters per second (m/s)

b)

Kilograms (kg)

c)

Newtons (N)

d)

Joules (J)

79.

What does constant speed mean?

a)

Equal distances in equal amounts of time

b)

Changing distances in equal amounts of time

c)

Equal distances in changing amounts of time

d)

Changing distances in changing amounts of time

80.

What is instantaneous speed?

a)

The speed at a given time

b)

The average speed over a journey

c)

The speed at the start of motion

d)

The speed at the end of motion

81.

When graphing motion, which variable is plotted on the x-axis?

a)

Time

b)

Distance

c)

Speed

d)

Velocity

82.

When graphing motion, which variable is plotted on the y-axis?

a)

Distance

b)

Time

c)

Speed

d)

Acceleration

83.

What does the slope of a distance vs. time graph represent?

a)

Speed

b)

Acceleration

c)

Time

d)

Distance

84.

If a graph shows a straight line with a constant slope in a distance vs. time graph, what does this indicate about the object's motion?

a)

The object is moving at a constant speed

b)

The object is accelerating

c)

The object is at rest

d)

The object is moving at a variable speed

85.

What changes when an object accelerates?

a)

Its mass changes

b)

Its velocity changes

c)

Its color changes

d)

Its shape changes

86.

Which of the following best defines acceleration?

a)

The rate at which mass changes over time

b)

The rate at which velocity changes over time

c)

The rate at which distance changes over time

d)

The rate at which temperature changes over time

87.

Acceleration can be a change in which of the following?

a)

Speed only

b)

Direction only

c)

Speed or direction

d)

Temperature

88.

A motorcyclist riding around the inside of a large barrel is an example of what kind of acceleration?

a)

Linear acceleration

b)

Centripetal acceleration

c)

Gravitational acceleration

d)

Rotational acceleration

89.

How do you calculate the average acceleration of an object moving in a straight line?

a)

Divide the object's mass by the time interval

b)

Divide the change in the object's velocity by the time interval

c)

Multiply the object's velocity by the time interval

d)

Add the object's initial and final velocities

90.

Explain why a person riding a Ferris wheel at an amusement park is considered to be accelerating, even if their speed remains constant.

a)

Because their mass is changing

b)

Because their direction is changing as they move in a circle

c)

Because their temperature is increasing

d)

Because their color is changing

91.

What does a positive acceleration mean in straight-line motion?

a)

The object's velocity is increasing—the object is speeding up.

b)

The object's velocity is decreasing—the object is slowing down.

c)

The object is moving at a constant speed.

d)

The object is changing direction.

92.

What is the SI unit for acceleration?

a)

meters per second per second (m/s²)

b)

meters per second (m/s)

c)

kilometers per hour (km/h)

d)

newtons (N)

93.

On a speed vs. time graph, what does the slope of a straight line represent?

a)

The acceleration of the object

b)

The distance traveled by the object

c)

The initial velocity of the object

d)

The mass of the object

94.

If the distance vs. time graph is not a straight line, what does this indicate about the object's motion?

a)

The object is under acceleration

b)

The object is moving at a constant speed

c)

The object is stationary

d)

The object is moving in a circle

95.

Explain how you can use a graph to determine if an object is accelerating. (DoK Level 3)

a)

By observing if the speed vs. time graph has a straight line with a slope, or if the distance vs. time graph is curved.

b)

By checking if the graph is colorful.

c)

By looking for the highest point on the graph.

d)

By counting the number of data points on the graph.

96.

Which of the following is NOT identified by scientists as a fundamental force of nature?

a)

Electromagnetic force

b)

Gravitational force

c)

Frictional force

d)

Strong nuclear force

97.

Which fundamental forces act only over a short distance?

a)

Gravitational and electromagnetic forces

b)

Strong and weak nuclear forces

c)

Frictional and gravitational forces

d)

Electromagnetic and frictional forces

98.

What is an example of a contact force?

a)

Gravity

b)

Pushes and pulls

c)

Electromagnetic force

d)

Strong nuclear force

99.

Field forces, such as gravity, differ from contact forces in what way?

a)

They require objects to touch each other

b)

They do not require objects to touch each other

c)

They only act over short distances

d)

They are weaker than contact forces

100.

Both contact and field forces can cause an object to do which of the following?

a)

Change color

b)

Stop moving or start moving

c)

Increase in temperature

d)

Become heavier

101.

Fundamental forces vary in which of the following ways?

a)

Only in the type of objects they affect

b)

Only in their color

c)

In strength and the distance over which they act

d)

In the temperature they produce

102.

What happens when there is a net force acting on an object?

a)

The object remains at rest

b)

The object changes its motion

c)

The object becomes invisible

d)

The object loses mass

103.

Which of the following best defines net force?

a)

The combination of all forces acting on an object

b)

The force that opposes motion between two surfaces

c)

The force that resists the initiation of sliding motion

d)

The force that causes objects to roll

104.

Balanced forces do not change the motion of an object. When are forces considered balanced?

a)

When the net force is zero

b)

When the net force is greater than zero

c)

When friction is present

d)

When objects are moving

105.

If you push a box to the east and your friend pushes it to the north, in which direction will the box accelerate?

a)

Northeasterly direction

b)

Southwesterly direction

c)

North direction only

d)

East direction only

106.

What force always opposes motion?

a)

Friction

b)

Gravity

c)

Tension

d)

Net force

107.

Which type of friction is greater: static friction or kinetic friction?

a)

Static friction

b)

Kinetic friction

c)

Rolling friction

d)

Sliding friction

108.

What is the difference between static friction and kinetic friction?

a)

Static friction resists the initiation of sliding motion, while kinetic friction opposes movement of surfaces that are already sliding

b)

Static friction occurs only when objects are rolling

c)

Kinetic friction is always greater than static friction

d)

Static friction only occurs in liquids

109.

Which type of friction occurs when a rounded object rolls over a flat surface?

a)

Rolling friction

b)

Sliding friction

c)

Static friction

d)

Kinetic friction

110.

When objects slide past each other, which type of friction is present?

a)

Sliding friction

b)

Rolling friction

c)

Static friction

d)

Balanced friction

111.

Which type of friction is generally less than the other?

a)

Sliding friction

b)

Rolling friction

c)

Both are equal

d)

Static friction

112.

What is one way to lower unwanted friction?

a)

Scattering sand on icy roads

b)

Using nonstick coatings on cooking pans

c)

Wearing textured batting gloves

d)

Increasing the weight of an object

113.

Why is friction necessary for cars to move?

a)

It helps the engine run smoothly

b)

It allows tires to push against the road

c)

It reduces the weight of the car

d)

It increases the speed of the car automatically

114.

Which of the following is an example of increasing helpful friction?

a)

Using lubricants on machinery

b)

Wearing textured batting gloves when playing baseball

c)

Applying wax to a surface

d)

Using nonstick pans

115.

If the force pushing a car forward is less than the force of friction, what will happen to the car?

a)

The car will accelerate

b)

The car will move at a constant speed

c)

The car will slow down or stop

d)

The car will fly off the road

116.

Explain why a constant force must be applied to a car to keep it moving at the same speed, according to the concept of friction.

a)

Because friction always increases as speed increases

b)

Because friction opposes the car’s motion and must be balanced by a forward force

c)

Because the car’s engine loses power over time

d)

Because the road surface is always rough

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