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Vectors and Projectiles
Vectors and Projectiles
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Answers
1
What is the relative velocity of the plane?
103 km/hr
25 km/hr
100 km/hr
125 km/hr
2
What is the relative velocity of the boat if you standing on the river bank ?
6 m/h
2 m/h
4 m/h
8 m/h
3
Which of the following is
FALSE
regarding flight time for a projectile?
time from start point to peak = fall time from peak to start point
projectiles from same launch angle will travel further with increased Vi
air time depends on vertical component of initial velocity only
4
A football is kicked at an angle of 45 degrees from horizontal. At the very top of the ball's path, its acceleration is
entirely horizontal
both vertical and horizontal
entirely vertical
not enough info
5
What is the relative velocity of the person ?
3 m/s
7 m/s
4 m/s
1 m/s
6
What is the trig function for comparing adjacent and hypotenuse?
cos
sin
tan
7
3 vectors are drawn. A 4th vector is drawn from tail of the 1st vector to the head of the last. This 4th vector is
the equilibrant
the hypotenuse
the resultant
a mistake
8
At what point in a projectile's path is the vertical component the smallest?
as it nears the starting point
it is the same throughout
as soon as it is released
at the top
9
If each component of a vector is increased by 1.5 times
magnitude will increase by 1.5 and the angle will increase
magnitude and the angle will decrease
the magnitude will increase 1.5 times and the angle stays the same
magnitude will decrease and the angle stays the same
10
What is the relative velocity of the plane?
125 km/hr
75 km/hr
100 km/hr
11
Which one of the following vector addition equations is shown in Diagram 3?
A + C = B
A + B = C
C + A = B
C + B = A
12
Relative velocity is based on
frame of reference
velocity
speed
trigonometry functions only
13
When an object is dropped from a height at rest, what is the initial velocity?
Δy
ΔX
-9.8 m/s2
0
14
An object is undergoing free fall. As it falls, the object's
none of these
speed increases
acceleration increases
both of these
15
Which of the following is
FALSE
about vertical motion of projectiles?
the vertical velocity is changing
vertical velocity changes at a rate of 9.8 m/s
the vertical velocity is 0 m/s at the peak
there is an upward component of acceleration
16
Which one of the following vector addition equations is shown in Diagram 2?
A + C = B
none of these
B + C = A
A + B = C
17
What is the trig function of comparing opposite and hypotenuse?
cos
sin
tan
18
In trigonometry functions, which compares opposite side to adjacent side?
tan
cos
sin
cotan
19
What is the general direction of the plane?
southwest
west
south
northeast
20
A football is kicked at an angle of 45 degrees from horizontal. At the very top of the ball's path, its velocity is
not enough info
entirely vertical
both vertical and horizontal
entirely horizontal
21
At what point in a projectile's path is the horizontal component the smallest?
as it nears the top
as soon as it is released
as it nears the starting point
it is the same throughout
22
What is the average velocity of a train moving along a straight track if its displacement is 216 m west for 12 s?
36 m/s West
9 m/s West
72 m/s West
18 m/s West
23
Which of the following is
FALSE
about horizontal motion of projectiles?
horizontal displacement is dependent upon flight time and initial velocity
a projectile with horizontal motion will have constant horizontal velocity
vertical velocity does not affect the horizontal velocity of an object
the horizontal velocity at the peak is 0 m/s and increases upon decent
24
Which of the following would be true about a dot diagram for an airplane flying at a constant speed of 850 km/h?
dots would start real close, get further apart, then get close again
dots would start real close then get further away
dots would be evenly spaced
dots would start off further apart then get closer together
25
A rock is shot straight into the air (no air resistance) during a volcanic eruption. When the rock descends
a is downward and V is upward, at highest point a and V are 0
a = 0 and speed decreases
both V and a are downward, and speed increases
a is downward, velocity is opposite acceleration
26
How would you find the exact direction of the plane?
tan-1(100/25)
tan(25/100)
cos-1(100/25)
tan-1(25/100)
27
Which of the following descriptions of moving objects does NOT accurately portrays a projectile?
an object upon which the only significant force is gravity
a falling skydiver with an open parachute
a falling feather in a vacuum chamber
a free falling object
