Transcript Force and Motion

1. Which of the following best represents
acceleration as presented on a graph?
a. Motion change vs. time
b. Distance change vs. time
c.
Speed change vs. time
d. Velocity change vs. time
D
2. Which of the following are two factors that
determine speed?
a. Acceleration and time
b. Velocity and time
c.
Distance and time
d. Motion and time
C
3. The difference between speed and velocity is
that
a. Velocity involves time, while speed does not.
b. Speed involves time, while velocity does not.
c.
Velocity has direction, while speed does not.
d. Speed has direction, while velocity does not.
C
4. When something changes position, what is it
doing?
a. It is static
b. It is a reference point
c.
It is lubricated
d. It is moving
D
5. Which of the following is a measurement of
velocity?
a. 16m east
b. 25 m/s
c.
55 m/h south
d. 60 km/h
C
6. In which of the following is a skater NOT
accelerating?
a. Going straight while speeding up
b. Going straight at constant speed
c.
Making circles at constant speed
d. Going straight while slowing down
B
7. A short time after jumping from an airplane, a
sky diver reaches a constant speed. Which of the
following statements about the sky diver is true?
a. The sky diver is accelerating toward the ground
at 9.8 m/s
b. An unbalanced force acts on the sky diver.
c.
No unbalanced forces act on the sky diver.
C
8. Two objects in motion have different masses. How does
the difference in mass affect the forces needed to make the
objects achieve the same rate of change of velocity?
a.
The object that has less mass will require more force to
achieve the same rate of change.
b.
Force does not affect the rate of change of an object.
c.
It will take the same about of force to achieve the same
rate of change for two objects.
d.
The object that has greater mass will require more force
to achieve the same rate of change.
D
9. Which of the following is an example of a
balanced force?
a. Baby pushed in a stroller on a sidewalk
b. A child running down a path
c.
A car traveling on a highway
d. A porch swing hanging from the porch roof
A
10. A force
a. Is expressed in Newtons
b. Can cause an object to speed up, slow down, or
change directions
c.
Is a push or pull
d. All of the above
D
11. When the net forces equal 0 N, they are which
of the following?
a. Balanced
b. Unbalanced
c.
A push
d. A pull
A
12. Which of the following always causes change
in speed, direction, or both?
a. Balanced forces
b. Unbalanced forces
c.
With balanced or unbalanced forces
d. Any combination of forces
B
13. Which of the following causes an object to start
moving?
a. Balanced forces
b. Unbalanced forces
c.
With balanced or unbalanced forces
d. Any combination of forces
B
14. What is a force that opposes motion between
two surfaces that are in contact?
a. Friction
b. Motion
c.
Velocity
d. Acceleration
A
15. What is the net force on an object when you
combine a force of 10 N north with a force of 5N
south?
a. 5 N south
b. 15 N north
c.
50 N north
d. 5 N north
D
16. If a student rides her bicycle on a straight road
and does not speed up or slow down, she is
traveling with a
a. Constant acceleration
b. Constant velocity
c.
Positive acceleration
d. Negative acceleration
B
17. An unbalanced force can cause an object’s
motion to change by
a. Changing direction or speed, starting but not
stopping motion
b. Changing direction or speed, starting or
stopping motion
c.
Changing direction or speed, stopping but not
starting motion
d. Changing direction or speed only
B
18. Which of the following pairs of forces is
balanced?
a. 16 N north and 16 N south
b. 16 N north and 16 N east
c.
16 N north and 16 N west
d. 16 N north and 16 N north
A
19. How will the motion of a ball rolling on the
ground change if the ball encounters a frictional
force that opposes its motion?
a. The ball will speed up
b. The ball will slow down
c.
The ball’s speed will not change
d. The ball will change direction
B
19. When an airplane take off you tend to fall
backward because of
a. Air resistance
b. Friction
c.
Gravity
d. inertia
D
20. Which of the following objects has the greatest
inertia?
a. Bowling ball
b. Golf ball
c.
Tennis ball
d. baseball
A
21. Friction acting on a rolling ball to eventually
bring the ball to a stop is an example of which of
the following?
a. An unbalanced force
b. Gravity
c.
A balanced force
d. momentum
A
22. What is a device that makes work easier by
changing the size or direction of force?
a. Power
b. watt
c.
Machine
d. force
C
23. What two things must happen for work to be
done?
a. The object must move and there must be an
output force
b. The object must move in the opposite direction
of the force
c.
The object must move in the same direction as
the force
d. The object must move and the mechanical
advantage must be greater than 1.
C
24. A doorknob is an example of a
a. Pulley
b. Wheel and axel
c.
Lever
d. screw
B
25. What is called when a force causes an object to
move in the direction of the force?
a. Energy
b. Force
c.
Work
d. Power
C