Chapter 2 Section 1
Gravity and Motion Review!
1. What is Terminal Velocity?
a. The motion of a body when only the force of
gravity is acting on the body.
b. The curved path of a thrown object near
Earth’s surface.
c. The constant velocity of a falling object when
the force of gravity is balanced by air
resistance.
d. The force that opposes the motion of objects
thrown in the air.
ANSWER
TERMINAL VELOCITY IS…
C. The constant velocity of a falling
object when the force of gravity is
balanced by air resistance.
2. What is Free Fall?
a. The force that opposes the motion of objects
thrown in the air.
b. The curved path of a thrown object near
Earth’s surface.
c. A song by Tom Petty and the Heartbreakers
d. The motion of a body when only the force of
gravity is acting on the body.
ANSWER
FREE FALL is…
d. The motion of a body when only the
force of gravity is acting on the body.
3. What is Projectile Motion?
a. The motion of a body when only the force of
gravity is acting on the body.
b. The curved path of a thrown object near
Earth’s surface.
c. The constant velocity of a falling object when
the force of gravity is balanced by air
resistance.
d. The force that opposes the motion of objects
thrown in the air.
ANSWER
PROJECTILE MOTION is…
b. The curved path of a thrown object
near Earth’s surface.
4. What is Air Resistance?
a. The force that opposes the motion of objects
thrown in the air.
b. The curved path of a thrown object near
Earth’s surface.
c. A song by Tom Petty and the Heartbreakers
d. The motion of a body when only the force of
gravity is acting on the body.
ANSWER
AIR RESISTANCE is…
a. The force that opposes the motion
of objects thrown in the air.
5. Which of the following is in
projectile motion?
a.
b.
c.
d.
A feather falling in a vacuum
A cat leaping on a toy
A car driving up a hill
A book laying on a desk
ANSWER
b. A cat leaping on a toy.
6. How is the acceleration of falling
objects affected by gravity?
a. Gravity is not the same for all falling objects.
b. Gravity prefers pulling larger objects over
smaller objects.
c. Gravity is constant for all falling objects.
d. Gravity prefers pulling smaller objects over
larger objects.
ANSWER
c. Gravity is constant for all falling objects.
7. If a baseball and a cannonball are
dropped from the same height at the same
time, and there is no air resistance, which
ball will hit the ground first?
a. The cannonball lands first.
b. The baseball lands first.
c. The balls land at the same time.
d. The ball with the larger volume
lands first.
ANSWER
c. The balls land at the same time.
8. A boy standing on a high cliff dives into the
ocean below and strikes the water after 3
seconds. What is the boy’s velocity when he hits
the water? (Hint: Gravity pulls all objects at a
rate of 9.8 meters/second)
a.
b.
c.
d.
29.4 m/s
36.2 m/s
18.6 m/s
15 m/s
ANSWER
a.
9.8 x 3 = 29.4 m/s
9. What feature of an object does not
affect air resistance?
a. Its size
b. Its chemical properties
c. Its shape
d. Its speed
ANSWER
b. Its chemical properties
10. When does an object reach its
terminal velocity?
a. When the upward force of air resistance
equals the downward force of gravity.
b. When the downward force of gravity is
greater than the upward force of air
resistance.
c. When the downward force of air resistance is
equal to the upward force of gravity.
d. When the upward force of air resistance is
greater than the downward force of gravity.
ANSWER
a. When the upward force of air resistance
equals the downward force of gravity.
11. A rock at rest falls off a tall cliff and hits the
valley below after 3.5 seconds. What is the
rock’s velocity as it hits the ground? (Hint: Think
about the rate of constant acceleration)
a.
b.
c.
d.
13.3 m/s
6.3 m/s
34.3 m/s
2.8 m/s
ANSWER
c. 9.8 x 3.5 = 34.3 m/s
12. Why do astronauts appear to be
floating when they are in space?
a. They are actually in free fall with the shuttle
around Earth.
b. It’s really good special effects.
c. They weigh more in space.
d. They are forced to eat bad food.
ANSWER
a. They are actually in free fall with the
shuttle around the Earth.
13. Centripetal force is….
a. An unbalanced force that causes objects to
move in a circular path.
b. The curved path of a thrown object near
Earth’s surface.
c. The path of one object around another in
space.
d. Luke Skywalker’s special friend
Answer
CENTRIPETAL FORCE is…
a. An unbalanced force that causes
objects to move in a circular path.
14. Which statement best describes
the word “orbit”?
a. The force that opposes motion of
objects through air.
b. The path of one object around another
in space.
c. The motion of a body when only the
force of gravity is acting on the body.
d. It’s an amusement park ride.
Answer
ORBIT is…
b. The path of one object around
another in space.
15. We could say that when an object
is in projectile motion it is….
a. The force that opposes the motion of objects
through the air
b. The constant velocity of a falling object when
the force of gravity is balanced by air
resistance.
c. The curved path of a thrown object near
Earth’s surface.
Answer
c. The curved path of a thrown object
near Earth’s surface.
GOOD LUCK TOMORROW!!
STUDY HARD!!
A copy of this guide is available on
Mr. C.’s website
Frost.sd54.org/mrcscience