AnswersTX-Physics AUnit Test

Centripetal Acceleration Answers

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1
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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
2
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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
3

In the formula vy = ayt, what is the value of ay for an object in projectile motion?

Question illustration
A
–9.8 m/s2
B
0 m/s2
C
m/s2
D
1.0 m/s2
4

Why is a baseball thrown by a pitcher considered to have projectile motion?

A
It gains a lot of kinetic energy.
B
It has horizontal and vertical motion.
C
It gets pulled to the ground by gravity.
D
It moves in a diagonal direction.
5

[BLANK]

A
diagonal
B
parabolic
C
perpendicular
D
tangential
6

Mohammed made a chart to list examples and nonexamples of projectile motion.Which best completes the chart?

Question illustration
A
a football thrown in the air
B
a kite flying on a string
C
a golf ball rolling off a table
D
water spraying from a fountain
7

Sung rolls a marble off the edge of a table. She rolls the marble off the same table again but at a different speed.

A
The marble’s horizontal and vertical velocities change.
B
The marble’s horizontal and vertical velocities remain the same.
C
The marble’s vertical velocity changes, but its horizontal velocity does not.
D
The marble’s horizontal velocity changes, but its vertical velocity does not.
8

Lexy throws a dart with an initial velocity of 25 m/s at an angle of 60° relative to the ground. What is the approximate vertical component of the initial velocity?

A
0.5 m/s
B
0.87 m/s
C
12.5 m/s
D
21.7 m/s
10

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.
11

Barry is conducting an experiment and rolls a tennis ball down a ramp. Which best describes the motion of the tennis ball?

A
It does not exhibit projectile motion and follows a straight path down the ramp.
B
It does not exhibit projectile motion and follows a parabolic path down the ramp.
C
It exhibits projectile motion and follows a straight path down the ramp.
D
It exhibits projectile motion and follows a parabolic path down the ramp.
12

The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of which function(s)?

A
tangent only
B
cosine only
C
sine and tangent
D
cosine and sine
13

Rosa uses the formula (vi cos)t to do a calculation. Which value is Rosa most likely trying to find?

Question illustration
A
the vertical acceleration of a projectile launched at an angle
B
the vertical acceleration of a projectile launched horizontally
C
the horizontal displacement of a projectile launched at an angle
D
the horizontal displacement of a projectile launched horizontally
14

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.

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