Answers350CR Integrated ScienceProjectile Motion

Lesson 4: Projectile Motion Answers

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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
2
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A
diagonal
B
parabolic
C
perpendicular
D
tangential
3

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.
4

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.
5

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
6

Projectile motion is a combination of which two types of motion?

A
parabolic and curved
B
straight and diagonal
C
horizontal and vertical
D
constant and linear
9

A basketball rolls off a deck that is 3.2 m from the pavement. The basketball lands 0.75 m from the edge of the deck. How fast was the basketball rolling?Seema lists the given values in a chart and determines that the unknown value is vx.

Question illustration
A
The y and x values are switched.
Option A
B
The unknown is , not vx.
Option B
C
The value for ay is not known.
D
The value of y should be –3.2 m.
Option D
10

best

T
The paper airplane’s motion is due to horizontal inertia and the vertical pull of gravity.
A
A force other than gravity is acting on the paper airplane.
T
The paper airplane’s motion can be described using only one dimension.
A
A push and a pull are the primary forces acting on the paper airplane.
11

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
12

A projectile is launched at a 30° angle relative to the ground. The projectile has an initial velocity of 15 m/s and travels through the air for 2 seconds.The horizontal displacement of the projectile, rounded to the nearest hundredth, is m.

Answer not available
13

Ingrid kicks a football with an initial velocity of 12 m/s at an angle of 45° relative to the ground.The horizontal component of the initial velocity to the nearest tenth is m/s.

Answer not available
14

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.
15

A baseball is launched horizontally from a height of 1.8 m. The baseball travels 0.50 m before hitting the ground.How fast is the baseball moving horizontally, rounded to the nearest hundredth? m/s

A
0.83
B
0.77
C
1.21
16

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.
17

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
18

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

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