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Semester 1 Final Exam Review Covering: Topic 1; Mechanics; Take out: your notes, your book (if you...
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Transcript of Semester 1 Final Exam Review Covering: Topic 1; Mechanics; Take out: your notes, your book (if you...
Semester 1 Final Exam Review
Covering: Topic 1; Mechanics;
Take out: your notes, your book (if you brought it), a whiteboard
Instructions• You will work together as a team within your
seating group• It will not be necessary to answer in the form
of a question…• It WILL be necessary to show complete work,
or draw diagrams, or do something else to visually represent your answer on your whiteboard
• Raise your hand when you’re done and your answer will be checked and appropriate scores awarded.
Semester Finals JeopardyPhysics
PhundamentalsWhat goes up
must come down
Get a move on!
May the Force be with
you
Impulses, Crashes, and
Coasters
10 10 10 10 10
20 20 20 20 20
30 30 30 30 30
40 40 40 40 40
50 50 50 50 50
As of Jan. 16, 2012, there were approximately 312,859,385 people
living in the United States.Report this number in terms of its
Order of Magnitude
Answer
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Fundamental Metric UnitsLength: MeterTime: Second
Mass: KilogramAmount of material: MoleElectric Current: AmpereLight intensity: Candela
Temperature: Kelvin
A mass is measured to be m=4.4±0.2 kg, and is moving with a speed v=18±2 m·s-1. find
the absolute uncertainty in the kinetic energy of the mass.
Answer
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JJsmkgmvK 7108.712)18)(4.4( 22212
21
%7.261.111.115.4%
%1.1110018
2%
%5.41004.4
2.0%
energy
velocity
mass
JJAbsUnc 200190)8.712()267.0(.
JKE 200700
Including both direction and units, what is the average acceleration due to the
gravitational field of Earth
Answer
What is the force of gravity that causes a 75.0 kg mass to accelerate (assume that air
resistance is negligible)
Answer
A basketball is thrown upwards with an initial velocity of 8.75 m·s-1. To what
maximum height will it reach?
Answer
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?
81.9
0
75.8
:
2
10
d
sma
v
smv
Known
56.7662.19
))(81.9(2)75.8(0
222
20
2
d
d
advv
md 90.3
A ball is tossed up into the air from a point 2.50 m above the ground with a velocity of 3.68 m·s-1. How much time will it take for
the ball to reach the ground?
Answer
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?
50.2
81.9
?
68.3
:
2
10
t
md
sma
v
smv
known
1
1
22
20
2
91.7
)(91.7)59.62(
)50.2)(81.9)(2(68.3
2
smv
downsmv
v
advv
t
t
atvv
81.959.11
)81.9(68.391.70
st 18.1
This is a two part question:-How can the average velocity of a moving object be determined from a
displacement-time graph?
-How can the displacement of a moving object be determined from a velocity-
time graph?
Answer
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The SLOPE of the displacement-time graph is equal to the velocityThe AREA UNDER THE LINE of a velocity time graph is equal to the displacement
A long-boarder has a constant acceleration of 1.5 m·s-2. How long will
it take for his velocity to change from 5.0 m·s-1 to 11.0 m·s-1?
Answer
This is a two part question:A runner runs 2 complete 400. m laps
on a track in 2.5 min. -What is her average speed (in m/s)?
-What is her average velocity (in m/s)?
Answer
A hiker walks 1.5 km NE, then turns and walks 2.5 km due north before hiking 6.0 km in a direction 30.0° SW. What is the hiker’s overall displacement from his starting point?
Answer
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kmy
kmx
06.1)45sin(5.1
06.1)45cos(5.1
1
1
kmy
kmx
5.2
0
2
2
kmy
kmx
0.3)0.30sin(0.6
2.5)0.30cos(0.6
3
3
kmy
kmx
6.00.35.21.1
1.42.501.1
kmd
d
yxd
1.4
)6.0()1.4( 22
22
NW
x
y 3.81.4
6.0tantan 11
A 55.0 kg box is pushed across the floor with a force of 450. N. If there is a
frictional force equal to 275 N, with what acceleration will the box move?
Answer
A 25.0 kg sign is hung from the ceiling with two cables that each make an angle
of 42.0° with the horizontal ceiling. What is the tension in each of the wires?
Answer
Give two specific examples of a contact force and two specific examples of a field
force (“at-a-distance” force)
Answer
A car with an initial velocity of 25.0 m·s-1 comes to a stop in 45.0 m. What is the
magnitude of the braking force acting on the car?
Answer
What does the area under a Force vs. Time graph represent?
Describe what kind of information this value can give us.
Answer
A soccer ball (m = 0.430 kg), initially at rest, is kicked and reaches a velocity of
25.0 m/s. If the time that the player’s foot is in contact with the ball is 0.685 s, what
average force is exerted by the foot?
Answer
A car, m1 = 1250 kg, is initally at rest. If it is struck from behind by a larger car, m2=1550
kg, which is traveling at 15.0 m/s.
If the two cars stick together after impact:a) What type of collision is this?
b) What is the final velocity of the cars after the collision?
Answer
A large safe (m = 725 kg) is lifted to a height of 4.75 m. When it reaches that
height, the rope holding it snaps, and the safe falls to the floor.
a) How much kinetic energy will it have when it reaches the floor?
b) What is the safe’s speed the instant before crashing into the floor?
Answer
A ball of clay, m=0.250 kg, is initially at rest when it is struck by an identical ball of clay that is traveling at a speed of 6.50 m/s.
How much kinetic energy is lost during the collision if both clay balls stick together
upon impact?
Answer