Name:
key
Period:
Conceptual Questions
10. Write the definition of acceleration. Write the equation that
defines acceleration as a sentence. Compare the two
sentences. Does yotÿr definition of acceleration match with
Section 4.1
5. What does the graph of a distance versus time look like wheÿa
an object is accelerating?
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how you find it mathematically?
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Tnne
Time
' Unit 2 Test review
Learning Level (3, 2, 1 ).__
Time-
"time
'rinse
Time
Time
Time
6. The ErgoBot--which operates as real-time tectmologyÿ
providing position, velocityÿ and acceleration
data----generated the graphs above.
11. ÿ The. four position versus time graphs above were
generated ÿ" the motion of a small car with real-time
tectmology (photogates) that sensed the motion of its
wheels.
a. Which of these show an object that has an acceleration
a. Which of these is showing accelerated motion?
b. Which gaph would create a sloped (up or down)
velocity versus time graph?
co iÿich of the graphs has a negative velociBÿ?
d. Which of the graphs shows an object at rest?
e. Which of the graphs show an object whose equation
of motion could be ÿitten as
of zero?
b. ÿich of the gaphs shows constant acceleration?
Constant acceleration produ:ces a velocity-time graph
with a straight lino,
c. Which graph shows the smallest amount of distance
traveled?
d. \,ÿich of these graphs would not create a cm'ed
distance versus time graph?
e. Which graph shows the greatest average acceleration?
f. Which of the graphs most tikely represents the motion
of an object that has an acceleration in the same
direction as its velocity?
7. The position equation, x = xo + vd + Y',arÿ, has three terms.
Write down the physica! significance for each of the tl'nee.
z = 15 m - (3 m/s)t?
12, t Ira bird flies at the constant velocib" of 125 nx/so then
what is its acceleration for the first 5 s?
If tlw velociÿ' is "constant, '" t/wn there is no acceleration,
8. In the equation v - vo = at, what does the term v - vo 13. C Describe what constant positive acceleration looks like on
an acceleration versus time graph, a velocfly versus time
represent?
graph, and a distance versus thne graph.
9. A student asks a friend the following question:
"How is acceleration different from velociD:?"
Which of the following answers would best help the student
understand acceleration? Why do you think so? Ask the
question yourself to some friends and think about their
anSÿ'VerS.
a. Acceleration has units of m/sÿ while velocity has units
14.
Which of the following might be described by a positive
initial velocity and a negative constant acceleration?
a. The brakes are applied to a car travelmg at 30 mph to
reduce its speed to 20 mph.
b. A car starts at rest and then begins to move backward
with increasing speed.
ofm/s.
b. How do you describe a change in speed from 10 to
20 mph that occurs over 2 s?
GUESS
15. The skier was going downhill and at the first photogate his velocity was recorded at 10 m/s and 20 s later the second
photogate recorded him at 30 m/s. What was the displacement between the two photogates?
V; 'ÿ /e,ÿ/(
3o./ÿ
+ OXzo)z_ _
z,--
Ztd- 7
16. The baseball was hit into center field where the Spartan fielder threw the runner out at second base. Naturally, he is
a Spartan. If the Spartan had to throw the ball 30 m to the base, and the runner was 3 s from the bag, how fast did he
throw the ball?
V-- do/
V-_ ?
17, The clovis car on a hill and forgot to put on the break, He is funny that way, Tÿolored miniature
"MÿOOÿ.ÿcar rollÿ the hill aÿr hit the side of a circus tent with an accelerationÿf 5 m!ÿ.ÿWhat was the
velocity of the clown car when it hit-thee'tent?
,÷ los
0ÿ...
(5I* ÷ o
18. The Spartan volleyball player hit the ball straight up. The ball landed 8 s latter in bounds to win the game. Draw a
velocity time graph and a position time graph to illustrate this motion.
Answers to 5-14
5: The graph becomes
10; Students invo sentences
cut%'ed=
should be very similar. Both
6a: B
should include that
6b: B, C, and D
acceleration is the change in
6c; c
velociÿ- over the change in
6d: B
time.
6e: A
6f: c
7:x0 iÿ the initial position.
1 ta: D
lÿb: D
1 'tC: B
object would travel is the
1 Id: c
11e: B
speed remained constant.
1 'If:
v0t is the distance that the
'tatÿ is the change in position
due to acceleration changing
x = zo + ! at2
the velociÿ" during the time
interval t.
8: The change in velociÿ,
lÿg: D
during the time t.
l'th: c
9; The first answer is
12:0 misÿ
technical and not veÿ" useful if
13: a vs. t graph: flat line
you don't already understand
above O.
the idea of acceleration. The
v vs. t graph: straight upward-
second answer is better
sloping line.
because it gets to the root of
x vs. t graph: parabola
acceleration as the change in
opening upwards.
velocity per nit time.
14: Answer a