3. Any change in position over time is an example of?
A.) force
B.) velocity
C.) motion
C.) motion
D.) friction L F

5. The newton is the SI unit of?
A.) force
A.) force
B.) motion
C.) friction
D.) velocity L F

7. The speed of an object in a particular direction is?
A.) motion
B.) velocity
B.) velocity
C.) force
D.) friction L F

9. A force that always acts to oppose motion is?
A.) friction
A.) friction
B.) unbalanced
C.) force
D.) balanced L F

11. C.) unbalanced When a batter in a baseball game hits the ball,
The ball changed direction and moves because
a _____________ force was applied to the ball.
A.) force
B.) friction
C.) unbalanced
C.) unbalanced
D.) balanced L F

13. When forces are ________ the object of the forces does not move.
A.) unbalanced
B.) balanced
B.) balanced
C.) force
D.) friction L F

15. Why does a ball thrown level to the ground move downward?
A.) There is no force on the ball.
B.) A force pulls ball in the direction it is thrown.
C.) Forces pull on the ball in both directions.
D.) Gravity pulls ball toward the ground.
D.) Gravity pulls ball toward the ground L F

17. Which type of cart will accelerate the least?
A.) An empty cart pushed with a hard force.
B.) A full cart pushed with a light force.
B.) A full cart pushed with a light force
C.) An empty cart pushed with a light force.
D.) A full cart pushed with a hard force. L F

19. Why does a block sitting on a table not move?
A.) frictional force
B.) surface friction
C.) no force applied
C.) no force applied
D.) kinetic friction L F

21. Which of the following is a balanced force?
A.) A baby pushed in a stroller.
B.) A child running down a path.
C.) A car traveling on a highway.
D.) A porch swing hanging from the porch roof.
D.) A porch swing hanging from the porch roof. L F

23. What two things does speed depend on?
A.) velocity and friction
B.) velocity and time
C.) distance and friction
D.) distance and time
D.) distance and time L F

25. B.) reference point What is an object that appears to stay in
place that helps detect motion in another
object?
A.) newton
B.) reference point
B.) reference point
C.) a black hole
D.) a lubricant L F

27. D.) the hands of a clock relative to the
Which of the following most closely illustrates motion by
relating it to a reference point?
A.) the velocity change of a train
relative to time
B.) the speed of a bicycle relative to the
direction of travel
C.) the distance a race car traveled
relative to the time of travel
D.) the hands of a clock relative to the
numbers on a clock
D.) the hands of a clock relative to the
numbers on a clock L F

29. In which of the following activities is
friction harmful?
A.) brakes stopping a car
B.) a person walking
C.) car engine parts wearing out
C.) car engine parts wearing out
D.) an eraser erasing L F

31. An unbalanced force can cause an object’s
motion to change by
A.) changing direction or speed, starting
or stopping motion
A.) changing direction or speed, starting
or stopping motion
B.) changing direction or speed;
starting but not stopping motion
C.) changing direction or speed;
stopping but not starting motion
D.) changing direction or speed
only L F

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