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WorksheetsTest 4
Total questions: 59
Worksheet time: 48mins
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 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
Displacement vectors of 1 km south, 3 km north, 6 km south, and 2 km north combine to a total displacement of
12 km.
6 km.
4 km.
2 km.
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.
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.
A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 1 s. What is the average speed of the object?
50 m/s
20 m/s
25 m/s
100 m/s
Vector addition is used when motion involves
more than one direction.
more than one velocity.
more than one speed.
all of the above
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 constant velocity
a vehicle moving down the street at a steady speed
Which example describes constant acceleration due ONLY to a change in direction?
increasing speed while traveling around a curve
an object at rest
traveling around a circular track
an object in free fall
An object moving at 30 m/s takes 5 s to come to a stop. What is the object’s acceleration?
30 m/s2
–30 m/s2
–6 m/s2
6 m/s2
A speed-time graph shows that a car moves at 10 m/s for 10 s. The car’s speed then steadily decreases until it comes to a stop at 30 s. Which of the following describes the slope of the speed-time graph from 10 s to 30 s?
linear, horizontal
curved, upward
linear, sloping downward
linear, sloping upward
A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train’s acceleration be described?
The train’s acceleration is positive.
The train is not accelerating.
The train will come to rest in 6 minutes.
The train’s acceleration is negative.
Which of the following statements is true?
An object that is accelerating is always changing direction.
An object has an instantaneous acceleration, even if the acceleration vector is zero.
An object at rest has an instantaneous acceleration of zero.
Instantaneous acceleration is always changing.
Examine Figure 11-1. If you were standing under the tree, which object would appear to be moving?
the tree
the airplane
the boy
the building
Which of the following relationships is correct?
1 N = 1 kg
1 N = 1 kg•m
1 N = 1 kg•m/s
1 N = 1 kg•m/s2
The SI unit of force is the
joule.
kilogram.
meter.
newton.
One kilometer equals 1000 meters. What does the prefix kilo- mean?
1
10
100
1000
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
25 minutes
none of the above
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 meter
18 meters
What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race?
km/s
km/h
m/s
cm/h
Instantaneous speed is measured
at the starting point.
when the object reaches its destination.
at a particular instant.
over the duration of the trip.
The slope of a line on a distance-time graph is
distance.
time.
speed.
displacement.
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
A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current at 5 km/h relative to the river. How can the velocity of the boat relative to the shore be calculated?
by subtracting the river current vector from the boat’s velocity vector
by dividing the river current vector by the boat’s velocity vector
by multiplying the vectors
by adding the vectors
The rate at which velocity changes is called
speed.
vectors
acceleration.
motion.
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
The slope of a speed-time graph indicates
direction.
acceleration.
velocity.
speed.
An object that is accelerating may be
slowing down.
gaining speed.
changing direction
all of the above
What is instantaneous acceleration?
how fast a speed is changing at a specific instant
how fast a velocity is changing at a specific instant
how fast a direction is changing at a specific instant
all of the above
When a pair of balanced forces acts on an object, the net force that results is
greater in size than both forces combined.
greater in size than one of the forces.
equal in size to one of the forces.
equal to zero.
As you push a cereal box across a tabletop, the sliding friction acting on the cereal box
acts in the direction of motion.
equals the weight of the box
is usually greater than static friction.
acts in the direction opposite of motion.
An open parachute increases air resistance of a falling sky diver by
decreasing the weight of the diver
increasing surface area.
increasing the terminal velocity.
reducing fluid friction.
Projectile motion is caused by
the downward force of gravity.
an initial forward velocity.
a final vertical velocity.
the downward force of gravity and an initial forward velocity.
An orange might roll off your cafeteria tray when you stop suddenly because of
the balanced forces acting on the orange.
the centripetal force acting on the orange.
the friction forces acting on the orange.
the orange’s inertia.
If a force of 10 N is applied to an object with a mass of 1 kg, the object will accelerate at
0.1 m/s2.
9 m/s2.
10 m/s2.
11 m/s2.
The acceleration due to gravity on the surface of Mars is about one-third the acceleration due to gravity on Earth’s surface. The weight of a space probe on the surface of Mars is about
nine times greater than its weight on Earth’s surface.
three times greater than its weight on Earth’s surface.
one-third its weight on Earth’s surface.
the same as its weight on Earth’s surface.
In which of the following are action and reaction forces involved?
when a tennis racket strikes a tennis ball
when stepping from a curb
when stepping from a curb
all of the above
When opposite poles of two magnets are brought together, the poles
attract each other.
repel each other.
cancel each other.
cause a net force of zero.
With which of the following is the weak nuclear force associated?
lightning
nuclear decay
ocean tides
static cling
The gravitational force between two objects increases as mass
decreases or distance decreases.
decreases or distance increases.
increases or distance decreases.
increases or distance increases.
The centripetal force acting on a satellite in orbit
acts as an unbalanced force on the satellite.
changes the direction of the satellite.
is a center-directed force.
all of the above
When an unbalanced force acts on an object,
the object’s motion does not change.
the object accelerates.
the weight of the object decreases.
the inertia of the object increases.
What kind of friction occurs as a fish swims through water?
fluid
rolling
sliding
static
The forces acting on a falling leaf are
air resistance and fluid friction.
gravity and air resistance.
gravity and static friction.
weight and rolling friction.
Figure 12-1 shows the motion of three balls. The curved paths followed by balls B and C are examples of
centripetal motion.
constant motion.
linear motion.
projectile motion.
The property of matter that resists changes in motion is called
friction.
gravity.
inertia.
weight.
According to Newton’s second law of motion, the acceleration of an object equals the net force acting on the object divided by the object’s
mass.
momentum.
velocity.
weight.
Your weight equals your
mass.
mass divided by the net force acting on you.
mass times the acceleration due to gravity.
mass times your speed.
Newton’s third law of motion describes
action and reaction forces.
balanced forces.
centripetal forces.
net force.
The product of an object’s mass and velocity is its
centripetal force.
momentum.
net force.
weight.
What is conserved when two objects collide in a closed system?
acceleration
momentum
speed
velocity
What force is responsible for the repulsion between two positively-charged particles?
centripetal
electric
gravitational
nuclear
Which universal force acts only on the protons and neutrons in a nucleus?
electric
gravitational
magnetic
strong nuclear
Which of the following universal forces is the most effective over long distances?
electric
gravitational
magnetic
strong nuclear
As an astronaut travels far away from Earth, her weight
decreases because gravity decreases.
decreases because her mass decreases.
increases because gravity increases.
remains the same because her mass remains the same.
The force that keeps an object moving in a circle is called
centripetal force.
fluid friction.
inertia.
momentum.
