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

peopleOM

Log810

8495.8)312859385(

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List 5 of the 7 fundamental metric units

Answer

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Fundamental Metric UnitsLength: MeterTime: Second

Mass: KilogramAmount of material: MoleElectric Current: AmpereLight intensity: Candela

Temperature: Kelvin

37.5 m·s-1 is equivalent to how many km·h-1?

Answer

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11351351

3600

1000

15.37

hkmh

s

m

km

s

mhkm

A motorcycle accelerates at a rate of 17.5 km·h-2. What is its acceleration in m·s-2?

Answer

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22

00135.01

1000

3600

1

3600

15.17

smkm

m

s

h

s

h

h

km

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

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9.81 m·s-2 towards the center of the Earth

What is the force of gravity that causes a 75.0 kg mass to accelerate (assume that air

resistance is negligible)

Answer

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NsmkggmFg 736)81.9()0.75( 2

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

Describe 2 factors that will increase the effect of air resistance acting on a

falling body.

Answer

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1. Increased surface area

2. Decreased mass

3. Increased velocity

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

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?

5.1

11

0.5

:

2

1

10

t

sma

smv

smv

known

st

t

atvv

0.45.1

0.6

)5.1(0.50.110

A plane flies 3000.0 km in 5.000 hours. What is its average velocity in

meters per second?

Answer

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17.166

3600

1

1

1000

000.5

0.3000

smv

s

h

km

m

h

km

t

dv

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

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1

1

0min5.2

0

3.560

min1

min5.2

.4002

smm

t

dv

sms

m

t

ds

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

In your own words, what are Newton’s three laws of motion?

Answer

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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

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218.30.55

175

)0.55()275450(

sma

a

maFnet

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

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Give two specific examples of a contact force and two specific examples of a field

force (“at-a-distance” force)

Answer

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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

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What does the area under a Force vs. Time graph represent?

Describe what kind of information this value can give us.

Answer

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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

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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

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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

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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

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