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 Unit 3 Quiz #4

 

 

For Questions #1-5: A ball is projected into the air at an angle to the horizontal. The ball subsequently undergoes projectile motion, rising towards its peak and subsequently landing at the same vertical position a horizontal distance of 20-m away. Use this scenario to answer the following questions.

1. Which of the following describe the horizontal velocity of a projectile? List all that apply.

a. constant magnitude

b. changes by 10 m/s every second

c. initially directed in one direction and later in the opposite direction

d. is 0 m/s throughout the entir trajectory

e. is 0 m/s at the peak of the trajectory


Useful Web Links

Horizontal and Vertical Components of Velocity

Characteristics of a Projectile's Trajectory

 

2. Which of the following describe the vertical velocity of a projectile? List all that apply.

a. constant magnitude

b. changes by 10 m/s every second

c. initially directed in one direction and later in the opposite direction

d. the same at the beginning as at the end

e. is 0 m/s at the peak of the trajectory


Useful Web Links

Horizontal and Vertical Components of Velocity

Characteristics of a Projectile's Trajectory

 

3. Which of the following describe the horizontal acceleration of a projectile? List all that apply.

a. 0 m/s/s

b. changing magnitude

c. has a magnitude of 10 m/s/s

d. initially directed in one direction and later in the opposite direction

e. none of the above are true


Useful Web Links

Characteristics of a Projectile's Trajectory

 

4. Which of the following describe the vertical acceleration of a projectile? List all that apply.

a. has a magnitude of 10 m/s/s

b. changing magnitude

c. is always directed in the direction which the object moves

d.initially directed in one direction and later in the opposite direction

e. 0 m/s/s


Useful Web Links

Characteristics of a Projectile's Trajectory

 

5. At the instant when a projectile reaches the peak of is trajectory, ____.

a. there are no forces acting upon the projectile

b. the acceleration of the projectile is 0 m/s/s

c. the vertical velocity is 0 m/s

d. the horizontal velocity is 0 m/s.

e. ...nonsense! None of these are true.


Useful Web Links

Characteristics of a Projectile's Trajectory


For Questions #6-9: A 2.0-kg projectile is launched at an angle to the horizontal. Initially, its horizontal velocity is 30 m/s and its vertical velocity is 20 m/s. Use this information to answer the following questions.

6. The projectile will be in the air for a time of approximately ____ seconds.

a. 1.5

b. 2.0

c. 3.0

d. 3.3

e. 4.0

f. 5.0

g. 6.0

h. 10.0


Useful Web Links

Horizontal and Vertical Components of Velocity

Non-Horizontally Launched Projectiles - Problem-Solving

 

7. At the peak of its trajectory, the net force acting upon the projectile is _____ N.

a. 0 N

b. 10 N

c. 20 N

d. 30 N

e. 40 N

f. 50 N

g. 60 N

h. 100 N


Useful Web Links

What is a Projectile?

 

8. The projectile will experience a horizontal displacement of _____ m.

a. 0

b. 10

c. 20

d. 20

e. 40

f. 50

g. 60

h. 90

i. 100


Useful Web Links

Horizontal and Vertical Components of Displacement

Non-Horizontally Launched Projectiles - Problem-Solving

 

9. In the moments after its initial projection, the projectile has ______. Include all that apply.

a. a greater horizontal velocity than its vertical velocity

b. a greater horizontal acceleration than its vertical acceleration

c. a greater horizontal net force than its vertical net force

d. an upward velocity and a downward acceleration

e. an upward velocity and an upward acceleration


Useful Web Links

What is a Projectile?

Characteristics of a Projectile's Trajectory

Horizontal and Vertical Components of Velocity


10. On the diagrams below, draw arrows to represent the forces which act upon the football before it reaches the peak, at the peak, and after it reaches the peak. Assume the football is a "projectile" that is moving through the air from left to right. Label the force(s) according to type.

 

 


Useful Web Links

What is a Projectile?


11. A golf ball leaves the club with an initial velocity of 68.2 m/s at an angle of 22.4 degrees. Determine the horizontal and vertical velocity components (i.e., vix and viy). PSAYW


Useful Web Links

Initial Velocity Components

 

12. Demonstrate your understanding of projectiles by filling in the following table for a projectile launched at an angle to the horizontal. (Note that the initial horizontal and vertical velocities are given.)

Time (s)
vx (m/s)
vy (m/s)
ax (m/s/s)
ay (m/s/s)
0
20
30
1
2
3
4
5
6


Useful Web Links

Horizontal and Vertical Components of Velocity

 

Problem-Solving:

13. A soccer ball is kicked horizontally off a 22.0-meter high hill and lands a distance of 35.0 meters from the edge of the hill. Determine the initial horizontal velocity of the soccer ball. PSAYW


Useful Web Links

Horizontally Launched Projectiles - Problem-Solving

 

14. A football is kicked with an initial velocity of 25 m/s at an angle of 45-degrees with the horizontal. Determine (a) the total time of flight, (b) the horizontal distance, and (c) the peak height of the football. PSAYW


Useful Web Links

Non-Horizontally Launched Projectiles - Problem-Solving

 

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Last updated on 11/2/00.