Name: 
 

Vectors and Projectile Motion


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Which of the following is a physical quantity that has a magnitude but no direction?
A
vector
B
resultant
C
scalar
D
frame of reference
 

 2. 
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, what can be said about its acceleration if air resistance is disregarded?
A
It is the same as when it was at the top of its path.
B
It is less than when it was at the top of its path.
C
It is greater than when it was at the top of its path.
 

 3. 
At what part of a path does a projectile have minimum speed?
A
Halfway to the top
B
At the top of its path
C
The instance it is thrown
D
When it returns to the ground
E
There's not enough information to say.
 

 4. 
An object is dropped and falls freely to the ground with an acceleration of g. If it is thrown upward at an angle instead, what would be its acceleration?
A
larger than g
B
0
C
g downward
D
g upward
E
none of the above
 

 5. 
If there is no air resistance, the vertical component of a projectile's velocity doesn't change.
A
Sometimes true
B
Always true
C
Always false
 

 6. 
Which of the following is a physical quantity that has both magnitude and direction?
A
frame of reference
B
resultant
C
scalar
D
vector
 

 7. 
What should be done in order to graphically find the components of a vector?
A
measure the sides of the rectangle
B
draw a rectangle so that the vector is the diagonal
C
draw the vector with correct magnitude and orientation
D
all of the above
 

 8. 
Which of the following is an example of projectile motion?
A
a rock dropped straight down into a wishing well
B
a thrown baseball
C
a plane taking off
D
a jet launching from an aircraft carrier
 

 9. 
Which of the following is an example of a vector quantity?
A
temperature
B
mass
C
volume
D
velocity
 

 10. 
If there is not air resistance, the horizontal component of a projectile's velocity doesn't change.
A
Always false
B
Sometimes true
C
Always true
 

 11. 
What results when a vector is multiplied or divided by a scalar?
A
A scalar if multiplied or vector if divided
B
A vectorsif multiplied or a scalar if divided
C
A vector
D
A scalars
 

 12. 
A cannonball is fired at some angle into the air. In the first second it moves 5 meters horizontally. Assuming it doesn't hit the ground and air resistance is negligible, how far does it move horizontally in the next second?
A
Less than 5 m
B
More than 5 m
C
5 m
D
Not enough information.
 

 13. 
What does a scalar quantity have?
A
time
B
direction
C
color
D
magnitude
 

 14. 
Jessica can jump vertically 1 meter from her skateboard when it is at rest. When the skateboard is moving horizontally, how high can Jessica jump?
A
higher
B
no higher
 

 15. 
At the instant a ball is thrown horizontally, an identical ball is dropped from the same height. Which ball hits the ground first if air resistance is disregarded?
A
The horizontally thrown ball
B
The dropped ball
C
Neither—they both hit the ground at the same time.
 

 16. 
Which of the following would NOT be considered a projectile?
A
A cannonball rolling off the edge of a table
B
A cannonball rolling down a slope
C
A cannonball thrown through the air
D
A cannonball thrown straight up
E
All of the above are projectiles.
 

 17. 
At the instant a ball is thrown horizontally, an identical ball is dropped from the same height. Which ball hits the ground first?
A
The dropped ball
B
The horizontally thrown ball
C
Neither. They both hit the ground at the same time.
 

 18. 
Which of the following are true when an arrow is used to represent a velocity vector?
A
the length of the arrow represents the speed
B
the direction of the arrow shows the direction of motion
C
the length of the arrow is drawn to a suitable scale
D
all of the above
E
none of the above
 

 19. 
A cannonball is launched from the ground at an angle of 70 degrees above the horizontal and a speed of 80 m/s. If there is no air resistance, with what speed will the ball land on the ground?
A
There is not enough information to say.
B
90 m/s
C
0 m/s
D
80 m/s
E
70 m/s
 

 20. 
In the absence of air resistance, what is the path of a projectile?
A
a hyperbola
B
a wavy line
C
Projectiles do not follow a predictable path.
D
a parabola
 

 21. 
What does a vector quatity have?
A
time and direction
B
magnitude and direction
C
magnitude and time
 

 22. 
Which of the following is not an example of projectile motion?
A
a volleyball served over a net
B
a baseball hit by a bat
C
a hot-air balloon drifting toward Earth
D
a long jumper in action
 

 23. 
If there is no air resistance, at what angle will a thrown ball go the farthest?
A
60 degrees
B
30 degrees
C
45 degrees
D
15 degrees
E
75 degrees
 

 24. 
Of which of the following is the horizontal component of a projectile's velocity independent?
A
the vertical component of its velocity.
B
the range of the projectile.
C
time.
 

 25. 
Objects accelerate toward the Earth at a rate of 9.8 m/s/s. This means that for every second that an object falls, its downward velocity does what?
A
stays at 9.8 m/s
B
decreases by 9.8 m/s
C
increases by 9.8 m/s
D
None of the above
 

 26. 
A ball is thrown straight upward at 25 m/s. If air resistance is disregarded, with what speed will the ball return to the thrower’s hand?
A
0 m/s
B
25 m/s
C
12.5 m/s
D
50 m/s
E
There is not enough information.
 

 27. 
A ball is thrown into the air at some angle. At the very top of the ball's path, what can be said about its velocity?
A
It is entirely horizontal.
B
It is both vertical and horizontal.
C
There's not enough information given to determine.
D
It is entirely vertical.
 

 28. 
A cannonball is launched horizontally from the wall of a fort. Disregarding air resistance, if the cannon has a barrel velocity of 110 m/s, where will the cannonball be 1 second later?
A
55 m down range
B
110 m down range
C
11 m down range
D
550 m down range
E
none of the above
 



 
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