Dr. Bullock
Physical Science Exam 2
NAME:
Physical Science Exam 2
Each question is worth 5 points. You may distribute your five points however you wish.
For example, “Question 1-5” will occupy the first five lines of your scantron, “Question
6-10” will occupy the next five lines of your scantron.
Question 1-5
Aristotle came up with the earliest theory of the way things moved. Its was based on
motion that could maintain itself without the aid of an outside agent which is known as
A. violent motion
B. inertia
C. natural motion
D. ether
E. none of these
Question 6-10
Aristotle developed an early version of the periodic table. What were the elements on
his periodic table?
A. Wood, water, fire, air
B. Earth, water, fire, air
C. Ether, earth, water, air, fire
D. Ether, water, air, fire
E. Ether, water, air, fire, sound
Question 11-15
Unlike scalars, vectors have which of the following?
A. Magnitude
B. units
C. position
D. direction
E. c & d
Question 16-20
Does the displacement of an object depend on the specific location of the origin of the
coordinate system?
A. Yes
B. No
C. Sometimes
D. It depends on the type of coordinate system
E. Only when the distance is much greater than the displacement
Dr. Bullock
Physical Science Exam 2
Question 21-25
Which one of the following has units of m/s2 ?
A. average speed
B. average acceleration
C. average velocity
D. instantaneous velocity
E. instantaneous speed
Question 26-30
The slope of a tangent line at a given time value on a position versus time graph gives
A. displacement.
B. instantaneous velocity.
C. average velocity.
D. instantaneous acceleration.
E. average acceleration
Question 31-35
Velocity is the time rate of change of what?
A. distance
B. speed
C. displacement
D. velocity
E. time
Question 36-40
Which of the following is true for a deceleration?
A. The velocity remains constant
B. The acceleration is in the same direction as the velocity
C. The acceleration is negative
D. The acceleration is zero
E. The acceleration is in the direction opposite to the velocity
Question 41-45
The slope of a tangent line at a given time value on a velocity versus time graph gives
A. displacement.
B. instantaneous velocity.
C. average velocity.
D. instantaneous acceleration.
E. average acceleration
Dr. Bullock
Physical Science Exam 2
Use the graph below to answer questions 46-60
Question 46-50
Referring to the graph above, which object(s) is traveling with a constant non-zero
speed?
A. A only
B. E only
C. C only
D. D only
E. B, C & D
Question 51-55
Referring to the graph above, what is the average velocity of object C?
A. 0 m/s
B. 1 m/s
C. 2 m/s
D. 3 m/s
E. 0.5 m/s
Dr. Bullock
Physical Science Exam 2
Question 56-60
Referring to the above graph, which line would represent an object(s) experiencing freefall?
A. A
B. B
C. C
D. D
E. B, C, & D
Question 61-65
When throwing a ball straight up, which of the following is true about its velocity v and
its acceleration a at the highest point in its path?
A. both v = 0 and a = 0
B. v ≠ 0, but a = 0
C. v = 0, but a ≠ 0
D. both v ≠ 0 and a ≠ 0
E. none of the above
Question 66-70
You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As
the two rocks continue to fall, what happens to their velocities?
A. both increase at the same rate
B. the velocity of the first rock increases faster than the velocity of the second
C. the velocity of the second rock increases faster than the velocity of the first
D. both velocities stay constant
E. none of the above
Question 71-75
Alice and Bill are at the top of a cliff of height H. Both throw a ball with initial speed v 0,
Alice straight down and Bill straight up. The speeds of the balls when they hit the
ground are vA and vB. If there is no air resistance, which is true?
A. vA < vB
B. vA = vB
C. vA > vB
D. impossible to tell
E. none of these
Dr. Bullock
Physical Science Exam 2
Question 76-80
Velocity
The slope of the relation pictured at right is:
(m/s)
A. ∆v/∆t
B. a constant
C. the rate of change of velocity with time
D. acceleration
E. all of the above
Time (s)
Question 81-85
You drop a rubber ball. Right after it leaves your hand and before it hits the floor, which
of the plots represents the v vs. t graph for this motion? (Assume your y-axis is
pointing up).
A.
C.
E. NONE OF THESE
B.
D.
Dr. Bullock
Physical Science Exam 2
Question 86-90
You toss a ball straight up in the air and catch it again. Right after it leaves your hand
and before you catch it, which of the above plots represents the v vs. t graph for this
motion?
A.
B.
C.
D.
E. NONE OF THESE
Dr. Bullock
Physical Science Exam 2
Question 91-95
The figure below represents the position of a particle as it travels along the x-axis. What
is the magnitude of the average velocity of the particle between t = 1 s and t = 4 s?
A.
B.
C.
D.
E.
0.25 m/s
0.50 m/s
0.67 m/s
1.0 m/s
1.3 m/s
Question 96-100
A car starts from rest and accelerates to 60 miles/hour in 8.2 seconds. What is the car’s
acceleration?
A. 7.3 ft/s2
B. 0.14 ft/s2
C. 88.2 ft/s
D. 0.093 ft/s2
E. 88.2 ft/s2
Dr. Bullock
Physical Science Exam 2
NAME:
You must show your work to get full credit.
1. (5 points) A car moving with a speed of 32.0 m/s. The driver sees an accident ahead
and slams on the brakes, giving the car a deceleration of 4.50 m/s2. How far does the car
travel after the driver put on the brakes before it comes to a stop?
2. (5 points) Assuming that it takes 0.10 s for the driver to react before applying the
brakes, what is the stopping distance (the distance from the point where the driver first
sees the need to stop to the point where the car comes to a stop) for a car traveling at
25 m/s if the deceleration due to the brakes is 3.5 m/s2? (HINT: stopping distance is
equal to the braking distance plus the reaction distance)
Dr. Bullock
Physical Science Exam 2
3. (5 points) A car is traveling with a constant speed when the driver suddenly applies
the brakes, giving the car a deceleration of 3.50 m/s2. If the car comes to a stop in a
distance of 30.0 m, what was the car's original speed?
4. (5 points) Two objects are dropped from a bridge, an interval of 2.00 s apart. What is
their separation 2.00 s after the second object is released?
Dr. Bullock
Physical Science Exam 2
EQUATIONS OF MOTION
g = 9.8 m/s2 = 32.2 ft/s2
a= f g
Conversion:
ft/s = 1.47 × mph
TO FIND
ACCELERATION
a
2
(SI: m/s , British: ft/s2)
mph = ft/s ÷ 1.47
WHEN GIVEN
t vi vf
t vi d
vi vf d
f
t a vf
INITIAL VELOCITY
vi
(SI: m/s, British: ft/s)
FINAL VELOCITY
vf
(SI: m/s, British: ft/s)
DISTANCE
d
(SI: m, British: ft)
t a d
a vf d
t a vi
a vi d
t a vi
a vi vf
t vi vf
TIME
t
(SI: s, British: s)
a vi vf
EQUATION TO USE
vf  vi
t
2d - 2 v i t
2. a 
t2
v 2  v i2
3. a  f
2d
4. a = f g
1. a 
5. v i  v f  a t
d at
6. v i  
t 2
7. v i  v f2  2 a d
8. v f  v i  a t
9. v f  v i2  2 a d
1 2
at
2
v 2  v i2
11. d  f
2a
t v i  v f 
12. d 
2
vf  vi
13. t 
a
10. d  v i t 