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PHY 102 MOD 4 Exam


1. Which of the following activities best illustrates the
practices of the scientific method?

a. Deciding
on the materials necessary to build a terrarium.

b. Following
the instructions to construct an electric generator.

c. Measuring
the time for an object to fall from different heights.

d. Designing
an electric circuit for a radio.

2. What cannot be the outcome of a science experiment?

a. A theory
is supported.

b. A theory
is disproven.

c. A theory
is proven.

d. A theory
is further refined.

3. A truck makes a sharp turn and a box falls out of the
truck bed. This is best explained using:

a. the law
of inertia.

b. Newton’s
second law of motion.

c. the law
of action and reaction.

d. Newton’s
third law of motion.

4. If an object increases its speed by the same amount each
second, its acceleration:

a. also
increases each second.

b. is

c. decreases
each second.

d. can
either increase or decrease depending on the circumstances

5. Which of the
following is NOT a part of the scientific method?

a. Making a
guess about the possible outcome.

b. Perform
experiments to test the predictions.

c. Organize
and analyze the data collected.

d. Repeating
a measurement until you get the desired result.

e. Formulating
a rule based on the experimental results.

6. Consider a basketball player making a jump shot. Once the player’s feet leave the floor, the
player’s acceleration:

a. depends
on the speed of the player.

b. depends
on the forward motion of the player.

c. depends
on the athletic ability of the player.

d. is equal
to 10 m/s2.

7. The acceleration of an object is caused by:

a. a change
in speed.

b. a change
in velocity.

c. a change
in direction.

d. an
unbalanced force.

8. Which of the following describes an accelerated motion?

a. Driving
uphill at a constant speed.

b. Driving
downhill at a constant speed.

c. Driving
around a circle at a constant speed.

d. Driving
on a straight road at a constant speed.

9. A ball is placed at the top of a hill and then
released. After 5 seconds it has a speed
of 20 m/s. What is the average
acceleration of the ball?

a. 10 m/s2

b. 0 m/s2

c. 100 m

d. 5 m/s2

e. 4 m/s2

10. A circus performer with a weight of 700 N hangs from the
middle of a bar supported by a vertical rope at each end. What is the tension force in each rope?

a. 700 N

b. 1400 N

c. 350 N

d. 1050 N

e. 0 N

11. Which object has the greatest momentum?

a. A truck
parked on the street.

b. A man
walking up a flight of stairs.

c. A race
car going around a turn at high speed.

d. A
bicyclist rolling downhill.

e. A salmon
swimming upstream.

12. Which of the following has the greatest density?

a. A 10 g
object with a volume of 10 cubic centimeter.

b. A 40 g
object with a volume of 20 cubic centimeter.

c. A 20 g
object with a volume of 5 cubic centimeter.

d. A 10 g
object with a volume of 2 cubic centimeter.

13. A 12 kg
box is pulled across the floor with a 48 N horizontal force. If the force of friction is 12 N, what is the
acceleration of the box?

a. 3 m/s2

b. 5 m/s2

c. 10 m/s2

d. 1 m/s2

e. 4 m/s2

14. A satellite orbits the earth in a circle with constant
speed. Which of the following is true?

a. The net
force on the satellite is zero because the satellite is not accelerating.

b. The net
force on the satellite is directed forward, in the direction of travel.

c. The net
force on the satellite is directed straight down, toward the Earth.

d. The net
force on the satellite is directed outward, away from the Earth.

15. Power is:

a. the same
as energy.

b. the same
as work.

c. the rate
at which a force is applied.

d. the rate
at which work is done.

16. What is the purpose of airbags in modern cars?

a. They
alert the police that a collision happened.

b. They
decrease the time of impact in a collision.

c. They
protect the car from being damaged during a collision.

d. They
decrease the force of impact on the driver and the passengers during the

17. Two marbles are released to roll down two frictionless
ramps. One marble rolls down a short,
steep ramp and the other marble rolls down a long, flat ramp. If they are
released from the same heights, how will the speeds at the bottom of the ramps

a. The
marble rolling down the short, steep ramp will have the greatest speed.

b. The
marble rolling down the long, flat ramp will have the greatest speed.

c. They
will have the same speed at the bottom of the ramps.

d. There is
not enough information to tell.

18. Consider a basketball.
In which situation will the basketball have the greatest buoyant force?

a. When the
basketball is floating on a lake.

b. When the
basketball is held under the surface of a pool.

c. When the
basketball is placed on the ground.

d. When the
basketball is thrown high into the air.

19. A 3 kg cart moving with a speed of 4 m/s collides with a
1 kg cart at rest. If the carts stick together after the collision, with what
speed will they move after the collision?

a. 3 m/s

b. 4 m/s

c. 2 m/s

d. 1 m/s

20. A 50 kg man is stepping to the right out of a 20 kg boat
that has not yet been tied to the dock.
He is thinking he will step onto the dock. What is most likely to happen?

a. The man
will move a small distance to the right and the boat will move a larger
distance to the left.

b. The man
will move to the right while the boat will stay in place.

c. The boat
will move to the left while the man will stay in place.

d. The boat
will move the same distance to the left as the man will move to the right.

e. The boat
will move a small distance to the left and the man will move a larger distance
to the right.

21 During which phase
change is heat absorbed?

a. Condensation

b. Evaporation

c. Freezing

d. Conduction

e. Convection

22. Heat travels from the sun to the earth by:

a. Sublimation

b. Conduction

c. Convection

d. Radiation

e. Deposition

23 Why does a piece of metal generally feel cooler to the
touch than a piece of wood?

a. The atoms
in the wood vibrate faster than the atoms in the metal.

b. Wood, in
general, is not a good insulator.

c. Metals,
in general, are good heat conductors.

d. Metals,
in general, have higher heat capacities than wood.

e. Metals
are just colder than wood when left in the same environment.

24. When a comb is charged negatively by running it through
your hair, the hair is

a. neutral.

b. charged
negatively, too.

c. charged

d. grounded.

25. When we say an appliance uses up energy, which of the
following actually happens?

a. Electrons
are removed from the circuit and placed elsewhere.

b. Kinetic
energy of the electrons is converted to heat and other forms of energy.

c. Electric
charges are used and will disappear as a result.

d. The
voltage of the outlet is lowered.

e. Electric
current is disappearing in the circuit.

26. Consider a 50W light bulb and a 100W light bulb
connected to a household outlet. Which of the following statements is true?

a. The 50W
light bulb has more current and less resistance.

b. The 100W
light bulb has more current and less resistance.

c. The 50W
light bulb has more current and higher resistance.

d. The 100W
light bulb has more current and higher resistance.

27. What is the basic purpose of a generator?

a. To
convert electrical energy to mechanical energy.

b. To
convert electrical energy to thermal energy.

c. To
convert thermal energy to mechanical energy.

d. To
convert mechanical energy to electrical energy.

28. When a boat is floating on a lake, the buoyant force on
the boat is equal to:

a. The
weight of the boat.

b. The
volume of the boat below the surface of the lake.

c. The
volume of the boat above the surface.

d. The mass
of the boat.

29. Compared to the amount of current in a wire connected to
a light bulb, the amount of current in the light bulb is:

a. greater

b. smaller

c. the same

d. sometimes
less and sometimes more

30. The purpose of a fuse or a circuit breaker is:

a. to limit
the amount of current in a circuit.

b. to
increase the amount of current in a circuit.

c. to limit
the amount of voltage in a circuit.

d. to
measure the amount of current and voltage in a circuit.

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