AnswersTX-Physics AUnit Test

Unit Test — Unit test Answers

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1
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How does an object’s motion change as a result of centripetal acceleration?

A
The speed decreases in the same direction.
B
The speed increases in the same direction.
C
The direction changes along with the speed.
D
The direction changes but not the speed.
2
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Which would cause the greatest increase in the acceleration of a satellite?

A
a decrease in the radius and the tangential speed
B
an increase in the radius and the tangential speed
C
a decrease in the radius and an increase in the tangential speed
D
an increase in the radius and a decrease in the tangential speed
3

The track of a roller coaster is shown below.

Question illustration
A
W
B
X
C
Y
D
Z
4

The cycle of day and night is a result of Earth’s spinning on its axis, which is Earth’s .

Answer not available
5

When is an object moving in uniform circular motion?

A
when it speeds up around a curve
B
when its tangential speed is constant
C
when it has no net force acting on it
D
when its acceleration is tangent to a circle
6

Johanna makes the table below to organize her notes about centripetal forces.Which type of force should she place in the cell marked X?

Question illustration
A
tension
B
gravity
C
friction
D
normal
7

An object is in circular motion. How will the object behave if the centripetal force is removed?

A
It would move in a line away from the circle’s center.
B
It would move in a line toward the circle’s center.
C
It would move in a curved, circular path.
D
It would move in a line tangent to the circular path.
8

Which situation during a basketball game involves centripetal acceleration?

A
The official tosses the ball up for the opening tip-off.
B
A player passes the ball to another player.
C
The basketball bounces off the backboard.
D
A player spins a basketball on his finger.
9

An object is represented by the dot on the motion map.

Question illustration
A
a satellite in orbit around a moon
B
a child on a swing that just stopped
C
a ball twirled on a string that just broke
D
a car driving around a curve
10

Lexy used the formula shown to calculate the force of gravity on a space shuttle.Fg = G

Question illustration
A
the difference between Earth’s mass and the space shuttle’s mass
B
the sum of Earth’s mass and the space shuttle’s mass
C
the mass of Earth
D
the mass of the space shuttle
11

best

T
The horizontal velocity of projectile X is changing, and the vertical velocity of projectile Y is constant.
T
The vertical velocity of projectile Y is changing, and the horizontal velocity of projectile X is constant.
T
The horizontal acceleration of projectile X is –9.8 m/s2, and the vertical acceleration of projectile Y is 0 m/s2.
T
The horizontal acceleration of projectile Y is –9.8 m/s2, and the vertical acceleration of projectile Y is 0 m/s2.
12

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth?

A
They are falling toward Earth at the same rate as the space shuttle.
B
They are falling toward Earth at a faster rate than the space shuttle.
C
They are too far from Earth to experience gravity.
D
They are too far from Earth to experience air resistance.
13

tangential speedcentripetal speedtangential accelerationcentripetal acceleration

A
tangential speed
B
centripetal speed
C
tangential acceleration
D
centripetal acceleration
14

gravityinertiacentripetal forcecentrifugal force

A
gravity
B
inertia
C
centripetal force
D
centrifugal force
15

Which expression can be used to calculate centripetal acceleration?

A
StartFraction 2 pi r over T EndFraction
Option A
B
StartFraction 4 pi squared r over r squared EndFraction
Option B
C
StartFraction 4 pi squared r over T EndFraction
Option C
D
StartFraction left parenthesis 2 pi r right parenthesis squared over r squared EndFraction
Option D
16

Which arrow best represents the path of an object with projectile motion?

A
A ladder in the middle with a vector pointing west.
Option A
B
A vector drawn north, labeled B.
Option B
C
Option
Option C
D
A vector drawn northeast, labeled D.
Option D
17

Which is an example of projectile motion?

A
a person throwing a rock
B
a child swinging on a swing set
C
an athlete running on a track
D
a teacher picking up a pencil
18

The tip of a fan blade is 0.61 m from the center of the fan. The fan turns at a constant speed and completes 2 rotations every 1.0 s.

A
6.0 m/s2
B
48 m/s2
C
53 m/s2
D
96 m/s2
19

Charlotte throws a paper airplane into the air, and it lands on the ground. Which best explains why this is an example of projectile motion?

A
The paper airplane’s motion is due to horizontal inertia and the vertical pull of gravity.
B
A force other than gravity is acting on the paper airplane.
C
The paper airplane’s motion can be described using only one dimension.
D
A push and a pull are the primary forces acting on the paper airplane.
20

The tip of a pinwheel is 0.24 m from the center. The pinwheel spins 5 times each second. What is the tangential speed of the tip of the pinwheel?

A
0.30 m/s
B
1.2 m/s
C
1.5 m/s
D
7.5 m/s

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