Multiple Choice Practice

7/31/2019 Multiple Choice Practice

1/46

A student in a physics class made a picture of thesituation but did not include the signs of the variables.

t o = 0 s x o = __ 20 m v o = __ 12 m/s a = __ 6.0 m/s 2

What are the signs of the three missing variables?x o v o a

1 + 2 + +3 + +

4 + + +5 +

x

A stoplight 20 m to the west turns yellow. Your car istraveling west at 12 m/s. You hit the brakes and decelerate ata rate of 6.0 m/s 2. Your car stops before it reaches thestoplight (which is considered to be at the origin).


2/46

The motion of a car is represented with the motion diagrambelow.

Which graph best matches the motion diagram?

5 No graph represents

the motion correctly

v

t

1 v

t

2

v

t 3

v

t

4

x

v initial v final

a


3/46

v o a 1 + 2 + +3 +4

A bicycle is moving on the road. Its motion is describedby the graph below.

What should the signs of v o and a be to be consistentwith the above graphical description?

v

t


4/46

A hot air balloon is stationary in thesky as seen in the picture.

A person throws a ball up in the airat 5 m/s.

Which set of equations best matchesthis process?

1. V f = (5.0 m/s) + (10 m/s 2) t

2. V f = ( - 5.0 m/s) + (10 m/s 2) t

3. V f = (5.0 m/s) + ( - 10 m/s 2) t

4. V f = ( - 5.0 m/s) + ( - 10 m/s 2) t

5. Either 2 or 3 are correct


5/46

Which description best represents this situation?

1 This is a car that is moving to the right and is acceleratingin the same direction.

2 A ball was thrown upwards in the air at a speed of 20 m/s.

3 A ball was thrown downwards at a height of 5 m at aspeed of 20 m/s.

Susy sees the mathematical representation below inher physics book.

ad vv

at t vd d

o

oo

2

21

22

2

2 / 10

/ 205

sma

smvmd

o

o


6/46

1. Yes, all three diagrams are consistent.

2. No, Diagram A is not consistent with the other two.3. No, Diagram B is not consistent with the other two.

4. No, Diagram C is not consistent with the other two.

5. None of the diagrams are consistent.

Are these three diagrams consistent with each other?

Alan sees the following three diagrams next to eachother in his physics book.

x

t

v

t

a

t A CB


7/46

Alan sees the following three diagrams next to eachother in his physics book.

x

t

v

t

a

t A CB

v t x

t


8/46

Bill pulls on a lawnmower parallel to the ground. The mowermoves at a constant speed up the hill.

x

y

moweronEarthF

moweronsurfacef F

moweronsurface N

moweronstudentF

x

y

moweronEarthF

moweronsurfacef F

moweronsurface N

moweronstudentF

x

y

moweronEarthF

moweronsurfacef F

moweronsurface N

moweronstudentF

1

3 4

Which free body diagram bestrepresents the forces on the mower?

x y

moweronEarthF

moweronsurfacef F

moweronsurface N

moweronstudentF

2


9/46

Tom pulls a mower at 40-degrees relative to the ground.

1 2

3 4

x 40 0

y

moweronsurfacef F

moweronEarthF

moweronsurface N moweronstudentF

y

x 400

moweronsurfacef F moweronEarthF


x

y

40 0

moweronsurfacef F moweronEarthF


y

x 40 0

moweronsurfacef F

moweronEarthF


Which free body diagram best

represents the forces on the mower?


10/46

Which diagram best represents the forces exerted on the carby the Earth and the Earths surface?

The motion of a car is represented with the motion diagrambelow.

x

x

y 1

x

y 2

x

y 3

x

y 4

a initialvfinalv

x

y 5

o


11/46

Kim pulls a sled on ice (no friction). The rope exerts a 150-Nforce at an angle of 20 0 above horizontal. The mass of thesled and her brother is 45 kg. g = 10 m/s 2. The situation isrepresented pictorially and mathematically.

Did the student mislabel or forget to include anything?

1) (150 N) should be (150 N) sin 20 o .

2) (150 N) should be (150 N) cos 20 o

3) Include a +(150 N) sin 20 o term in the y equation.

x x : (150 N) = (45 kg) a x

y : N (45 kg)(10 m/s 2) = (45 kg) 0

4) Both (1) and (3) need corrections.

5) Both (2) and (3) need corrections.


12/46

What are the missing signs?

x : (150 N) cos 20 o = (45 kg) a x y : __ N __ (45 kg)(10 m/s 2) __ (150 N) sin 20 o = 0

1) + +

2) + +

3) +

4)

5) + + +

Kim pulls a sled on ice (no friction) with a 150-N force at anangle of 20 0. The mass of the sled and her brother is 45 kg.g = 10 m/s 2. The situation is represented pictorially andmathematically.

x o


13/46

Which word description below best matches the abovemathematical description?

1 The 0.80 N force of the Earth on the object causes its speed in

the x direction to increase from 0 to 16 m/s.

2 The object slows down due to a 0.80 N frictional force.

3 The object has a 10 m/s 2 acceleration in the y direction.

4 The net force causing the object to slow down is exerted in thesame direction as the initial velocity.

5 The objects velocity increases from 0 to 16 m/s.

x : 0 (0.80 N) = (1000 kg) a x y : N (1000 kg)(10 m/s 2) = (1000 kg) 0

0 16 m/s = a x t


14/46

Which FBD best represents the above motion diagram for acar?

x

y 1

x

y 2

x

y 3

x

y 4

caronEarthF

caronEarthF

caronEarthF

caronEarthF

caron)surface(F

caronairF

caron)surface(F

caron)surface(F

caron)surface(llF caronairF caron(ll)surfaceF

caron(ll)surfaceF caron(ll)surfaceF

initialv

finalv

caron)surface(F


15/46

A sign hangs on the side of a building, as shown below.

What free-body diagramrepresents this situation?

1 signonwireF

signonEarthF

F wallonsign

3signonwireF

signonEarthF

F wallonsign

2signonwireF

signonEarthF

F wallonsign


16/46

1

Which FBD below best representsthe forces exerted on the ball as it

moves UP (ignore air resistance)?

ballonEarthF

ballonpersonF 2

ballonEarth

F 3

ballonEarthF

ballonpersonF 4

ballonEarthF

ballonpersonF


17/46

x

y

CaronEarthF

Caron)(SurfaceF

Which speed versus time chart best represents thissituation?

1 2 3v

t

v

t

v

t

Caron)ll(SurfaceF


18/46

Based on the description above, what can you say

about the masses of the objects?

A situation is described mathematically:

)10()5()0()0( 2121 sm

msm

msm

msm

m

1 2

1 2

2 1

1 2

2 1

1.2. 5

3. 5

4. 2

5. 2

m mm m

m m

m m

m m


19/46

A small person is walking across a massive freelyfloating raft in the water. Which picture represents thisprocess?1

personv

2

3

personv

personv

personv4

raftv

raftv

raftv


20/46

A pendulum swings down and hits apiece of clay at the bottom. Which

verbal description best matches thepictorial description?

1 According to the conservation of energy, the increased mass

implies increased energy. y > y o.2 Since energy is conserved, mass is not important. y = y o.

3 Momentum must be conserved when the pendulum hits theclay, giving it a smaller velocity--so y < y

o.

4 There is no accurate way to determine how y and y o compare.

y o y


21/46

A process is described mathematically:

finalinitial

M M M M )sm

5.2(4)sm

10()sm

5(4)sm

0(

4M M M 4M

smv / 0 smv / 5.2 smv / 10smv / 51.

4M M M 4M

smv / 0 smv / 5.2 smv / 10smv / 53.

4M M M 4M

smv / 0 smv / 5.2smv / 10smv / 5

2.

Which of the diagrams best matches the description?


22/46

1 The energy in the system changes. This change is equal to the forcethat Joe exerts on Dan multiplied by the distance Dan moves.

2 The energy in the system changes. This change is equal to the force

that Joe exerts on Dan multiplied by the distance Dan moves multipliedby the cos 40 o.

3 Dan is moving at a constant speed, thus the net force exerted on Danis zero. Zero net force means zero work. Thus, the energy of thesystem does not change.

Joe pulls Dan at constant speedupward along a frictionless water

slide.

Which of the following statementsbest describes the situation?

40 o

Earth

System


23/46

Sue is carrying a basket of laundry to be washed. Thismotion is represented by a free body diagram and a motiondiagram.

Which verbal description bestmatches the diagrams? (The earthand basket are the system)

1 Since the basket is moving, work is done on the basket and that is allwe are able to tell.

2 Sue does work, but the systems energy does not change.3 The velocity is constant, the height is constant and Sue is doing work.

The internal energy of the system must be increasing.

4 No work is being done on the system which implies the systemsenergy does not change.

=constant

y

x

Earth

basketonhandF

basketonearthF

v


24/46

Alan is on a frictionless kiddie coaster.

Which energy bar chart bestmatches this situation as thecar goes to the bottom?

h i =h v

i =0

h>h f >0 v f >0

K i + U gi W = K f + U gf

K i + U gi W = K f + U gf K i + U gi W = K f + U gf

1

23


25/46

If the same coaster was notfrictionless, which bar chartwould describe that process?

h i =h v

i =0

v f >0 K i + U gi W = K f + U gf + E


1

23K i + U gi W = K f + U gf + E

h>h f >0

A ll i i d ib d b h b


26/46


A roller coaster cars trip is described by the energy bar chart shown below.

Which final point in thepicture below matches thebar chart?

Initial

1 Final

2 Final

3 Final

4 Final

5 Finaly

0

Th b h b l i


27/46

K i + U gi W = K f + E

The energy bar chart below represents a cars motion.

Which motion diagram matches this situation?

initialv

finalv

finalv

initialv

finalv

initialv 0finalv

1

4

2

3initial

v

A i i h i t ll d ib d b th ti


28/46

A car is moving horizontally as described by the motiondiagram below.

Which energy bar chart best matches this?final

vinitialv

K i + U gi W = K f + U gf 1

3


K i + U gi W = K f + U gf 4 K i + U gi W = K f + U gf

2


29/46

Two charged spheres are brought together. The electricfield measured at point A, points at a 45 o angle North ofWest.

Which of the following pictures below matches theabove description?

1 3

2

+q +q

x

x

+q

+q

x

x

+q

+2 q

x

x

AA

A


30/46

A textbook shows the following equation:

Which of the following verbal descriptions best matchesthe above mathematical representation?

(1.6 x 10 -5 C) (5.0 x 10 6 N/C) 10 N = (0.015 kg) a

1 A proton is in electric field that experiences a 10 Nforce holding it back.

2 A 0.015 kg object experiences just one force due to a5.0 x 10 6 N/C electric field.

3 A charged particle is accelerating in an electric fieldbut also experiences a 10 N opposing force.

4 A particle with charge of 1.6 x 10 -5 C is accelerated by

a 10 N force.

A proton starts at rest between metal sheets with a


31/46

A proton starts at rest between metal sheets with apotential difference of 100 Volts across them.

Which motion diagram could match the protons motionwhen released?

1

3

2

4

V init = 100 V V final = 0 V


32/46

A situation is described mathematically:

The same situation is described in words below. Decidewhich description fits the mathematical description best.

t e N

I D )3060()10x6.1()10x3( 1912

I

1 3 x 10 12 protons travel through a wire each hour.

2 3 x 10 12 electrons travel through a wire in each hour.

3 3 x 1012

electrons travel through a wire in just under anhour.

4 3 x 10 12 Coulombs of charge travel through a wire in justunder an hour.


33/46

1. Both pith balls are positively charged.

2. Both pith balls are negatively charged.

3. One pith ball is positively charged, the other isnegatively charged.

4. Both 1 and 2 are possible solutions

A picture is drawn below showing equipotential surfacesfor two fixed charged pith balls.

Which of the following verbal descriptions best match

the above equipotential surfaces?


34/46

Two positive chargesboth with charge + q ,separated by a smalldistance along thehorizontal axis.

Two particles, one withcharge +q , the other with a charge q ,

separated by a smalldistance along thehorizontal axis.


35/46

Three identical magnitude charged spheres are shownbelow.

Which electrical force diagram for objects correspondsto the pictorial representation?

+q 1 +q 2 -q 3

y

x

q3onq1F

q3onq2F

y

x

q3onq1F

q3onq2F

y

x

q3onq1F

q3onq2F

y

x

q3onq1F

q3onq2F

1

4

3

2

Four charged spheres not necessarily the same magnitude


36/46

A B C D

1 + +2 +3 + +4 + + + +5 + +

Four charged spheres, not necessarily the same magnitudecharge, are placed at the corners of a square. The netelectrical force on sphere C is zero.

What are the signs of the charged spheres to match theabove verbal description?

A

B

C

D


37/46

Steve sees the following circuit in their physics

textbook:

Which one of the following mathematicalrepresentations best matches the above picture?

1 V total = I R 1 + I R 2 + I / R 3 + I / R 4

2 V total = I R 1 + I R 2 + I R 3 + I R 4

3 V total = I R 1 + I R 2 + (I/2) (1 / R 3 + 1 / R 4)

4 V total = I R 1 + I R 2 + I (1/R 3 + 1/ R 4)-1

R 1 R 2 R 3

R 4


38/46

Which verbal description below best matches the abovemathematical representation of a circuit?

1. The first resistor is in series while the other three are

in parallel.2. Resistors two and three are connected in parallel to

each other. They are then connected in series toresistor four. This combination is in series to resistor

one.3. Resistors two and three are connected in series to

each other. They are connected in parallel to resistorfour. This combination is in series with resistor one.

V total = I R 1 + I [(1/(R 3 + R 2) + 1 / R 4)]-1

Emma read the following passage about circuits:


39/46

Emma read the following passage about circuits:

We know that the 1st and 4 th resistors in a circuit have the same amount of current flowing through them and

the other resistors have a different value of current flowing through them.

5 No circuit shown matches the description

R 3

R 4 R 2 R 1 1

Which one of the following circuits below best match the

description? R 1 R 2 R 3

R 4

2

R 1 R 2

R 3

R 4 3R 1 R 2 R 3

R 4

4


40/46

Steve is hooking up light bulbs. The flow of current throughtwo of the three bulbs is the same while a different currentflows through a third. All bulbs have the same resistance.

Which of the circuits below best matches the aboveverbal description.

1

5

2 3

4 1 & 4


41/46

John sees the following circuit in his textbook.

Which of the mathematical representations below bestmatches the above diagram?

R1

R2

R3

1

321 R

1

R

1

R

1V I

)RRV(R 321 I

321 R

1

R

1

R

1V I

2

3

A picture of a basic flash light (wire and batteries of


42/46

A picture of a basic flash light (wire and batteries of

negligible resistance) is shown below.

Which circuit best matches the above picture?

12

3 4

5 No circuit matches the picture.


43/46

Which free body diagram represents the moment when theproton enters the magnetic field region?

1

ponfieldF

ponearthF

3

ponfieldF ponearthF

proton

B Field out of screen

v

2

ponfieldF

ponearthF


44/46

Which diagram below describes the situation at point A?(All are at right angles)

N S

A

+ -

1current

B field A

currentonmagnetF

2current

B field

A

currentonmag.F

3

current

B field

currentonmagnetF

A

l h h d d


45/46

An electron is moving to the right at a constant speed andenters a magnetic field that is pointed towards the right.

Which motion diagram matches the above description?

1

4

3

52


46/46

Two magnets are hung as seen above. Which diagrambelow represents the magnetic field lines?

1

NS

2

3 4

Documents

Multiple Choice Practice