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Kinematics!
Kinematics!
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Quick review of kinematics unit
Flashcards
32 cards
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Practice quiz
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Host live
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Questions
32
Answers
1
Object accelerates from -6.8m/s to 23.2m/s in 18s. To get Δx, what equation?
vf2 = vi2 + 2aΔx
Δx = 1/2(vi + vf)t
Δx = vi t + 1/2at2
vf = vi + at
2
Apparent weight is actually an ____ vector, most typically _______.
Downwards; Fg
Downwards; FN
Upwards; FN
Upwards; Fg
3
A person walking 10 m/s goes to 15 m/s in 2.0 seconds. What is his average acceleration?
5 m/s2
2.5 m/s2
cannot be determined
10 m/s2
4
In Physics equations, weight can be symbolized as
fk
Fg
Fa
FN
5
The slope of a velocity-time graph is the _______ of the motion.
Acceleration
Velocity
Displacement
Time Elapsed
6
A person walks a constant velocity of 15 m/s for 10 seconds. What is his acceleration?
-15 m/s2
0 m/s2
15 m/s2
1.5 m/s2
7
When using Physics laws, time must be in units of
Meters
Hours
Minutes
Seconds
8
385 N/m must be a(n)
Spring constant
Acceleration
Force
Mass
9
The rate of your change in displacement over time is your
speed
time
velocity
acceleration
10
You can always recognize a mass or inertia because it’s number will be followed by SI units of
Newtons
Pounds
m/s2
kg
11
Object at rest gets to 2985m after 20.5 s of motion. To get a what equation works?
Δx = 1/2(vi + vf)t
vf = vi + at
vf2 = vi2 + 2aΔx
Δx = vi t + 1/2at2
12
The straight line change in your position, including direction, is known as your
displacement
velocity
distance
speed
13
Object covers 876 m accelerating from 8.9 m/s to 99.4 m/s. To get a what equation?
vf2 = vi2 + 2aΔx
Δx = vi t + 1/2at2
vf = vi + at
Δx = 1/2(vi + vf)t
14
What famous rapper unleashed the lyrics: S equals d divided by t?
Eminem
Snoop Dog
M.C. Buπermilk
Lupe Fiasco
15
the rate of your change in velocity is your
acceleration
frame of reference
speed
none of the above
16
The rate of your distance change is your
time
velocity
speed
acceleration
17
A car moves 30 meters in 2.0 seconds, so it has an average speed of
15 m/s
0.067 m/s
30 m/s
60 m/s
18
Two observers may observe the same object but disagree on its motion due to their having
Bias in judgement
Different frames of reference
Visual problems
Different units of measurement
19
As long as you are on the surface of Earth, 9.81 m/s
2
can be used as value for what variable?
Fg
g
FN
vg
20
A rate means that something is being measured or described as changing over
direction
a distance
a repeating cycle
time
21
You can always recognize force in Physics because the number is always followed by the SI unit
Pound
Newton
m/s2
kg
22
If an object goes backwards 20.0 meters in a straight line for 4.0 seconds its velocity is
-80 m/s
5 m/s
80 m/s
-5 m/s
23
Speed can be greater than your velocity, but your velocity can never be greater than your speed
my head hurts
False
dunno
True
24
The slope of a position-time graph lets you know____ of the motion.
the displacement
the time elapsed
the acceleration
the velocity
25
What does the y-axis of a position-time graph tell you about the motion of an object?
its velocity
its position at any given moment.
all of the above
its time elapsed
26
The x-axis of a position-time graph lets you know
the velocity of the motion
the position of an object at any given moment
the time elapsed of the motion
all of the above
27
(v
f
- v
i
)/t is the equation for solving
velocity
time elapsed
speed
acceleration
28
In old English system, the unit of _______ is used for force instead of Newton’s.
Stone
Foot-pounds
Slug
Pounds
29
A person walking 15 m/s goes to 10 m/s in 2.0 seconds. What is her acceleration?
-2.5 m/s2
-5 m/s2
2.5 m/s2
5 m/s2
30
The meters of your total path, no matter what direction or shape, is your
position
distance
displacement
velocity
31
This can also be described by the equation: x
f
-x
i
and the symbol Δx.
position
distance
displacement
acceleration
32
An object accelerating at 23.5 m/s
2
for 18 s now moves 2385 m/s. To find v
i
, what equation?
Δx = vi t + 1/2at2
Δx = 1/2(vi + vf)t
vf = vi + at
vf2 = vi2 + 2aΔx
