Which of the following is not used to reduce friction?

whee

ls

bal

l bea

rings

oil

rough s

urface

s

0% 0%0%0%

A. wheels

B. ball bearings

C. oil

D. rough surfaces

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Which of the following is not a fluid?

air

Sugar

Wat

er oil

0% 0%0%0%

1. air

2. Sugar

3. Water

4. oil

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When forces are balanced, the motion of the object

is d

ecre

ased

.

is in

crea

sed.

does

not c

hange

.

is c

omple

tely

sto

pped.

0% 0%0%0%

1. is decreased.

2. is increased.

3. does not change.

4. is completely stopped.

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For every action, the reaction is

equal

and in

the

sam

e...

equal

and o

pposite

.

uneq

ual a

nd opp

osite

.

uneq

ual a

nd in

the

s...

0% 0%0%0%

A. equal and in the same direction.

B. equal and opposite.

C. unequal and opposite.

D. unequal and in the same direction.

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Near the surface of the Earth, the acceleration due to gravity is 9.8

m/sec/sec. After falling 6 sec, an object

would have a velocity of

3.8

m/s

ec.

9.8

m/s

ec

15.

8 m

/sec

.

58.

8 m

/sec

.

0% 0%0%0%

A. 3.8 m/sec.

B. 9.8 m/sec

C. 15.8 m/sec.

D. 58.8 m/sec.

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Acceleration is produced when a force acts on a mass is described

by Newton’s

firs

t law

of m

otion.

sec

ond la

w o

f mot

ion.

third

law o

f motio

n.

law o

f univ

ersa

l gra

vi...

0% 0%0%0%

1. first law of motion.

2. second law of motion.

3. third law of motion.

4. law of universal gravitation.

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The weight of an object varies with the

pull

of gra

vity

.

volu

me

of the

obje

ct.

dim

ensi

ons o

f the

obj..

.

spee

d of t

he obj

ect.

0% 0%0%0%

1. pull of gravity.

2. volume of the object.

3. dimensions of the object.

4. speed of the object.

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Forces can cause objects to

sto

p movi

ng onl

y.

chan

ge d

irect

ion o

nly.

sta

rt m

oving

only.

sta

rt m

oving,

chan

ge ...

0% 0%0%0%

A. stop moving only.

B. change direction only.

C. start moving only.

D. start moving, change direction, or stop moving.

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A force that sets an object into motion is

bal

ance

d.

fric

tion.

unbal

ance

d.

iner

tia.

0% 0%0%0%

1. balanced.

2. friction.

3. unbalanced.

4. inertia.

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Wheels and ball bearings change sliding friction to

sta

tic fr

ictio

n.

rolli

ng fri

ctio

n.

fluid

fric

tion

all

types

of f

rictio

n.

0% 0%0%0%

1. static friction.

2. rolling friction.

3. fluid friction

4. all types of friction.

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The function of lubricants is to change

fluid

fric

tion to

slid

ing...

fluid

fric

tion to

rolli

ng ...

slid

ing fr

ictio

n to

fluid

...

slid

ing fr

ictio

n to

rolli

..

0% 0%0%0%

1. fluid friction to sliding friction.

2. fluid friction to rolling friction.

3. sliding friction to fluid friction.

4. sliding friction to rolling friction.

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Treads on tires

incr

ease

fric

tion.

redu

ce fr

ictio

n.

dec

reas

e st

opping m

...

pre

vent t

he bra

king o

...

0% 0%0%0%

1. increase friction.

2. reduce friction.

3. decrease stopping motion.

4. prevent the braking of a car.

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An example of rolling friction is

a s

tack

of c

arto

ns b

e...

the

use o

f bal

l bea

rings.

the

fall

of a fe

athe

r t...

san

d pla

ced o

n an ic

...

0% 0%0%0%

A. a stack of cartons being pushed across a floor.

B. the use of ball bearings.

C. the fall of a feather through the air.

D. sand placed on an icy walk.

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An example of friction other than sliding or rolling is

push

ing a

des

k ac

ros.

..

wal

king

acr

oss a

floor.

float

ing d

ownwar

d aft.

.

ridin

g on a

ska

teboar

d.

0% 0%0%0%

A. pushing a desk across a floor.

B. walking across a floor.

C. floating downward after diving off a cliff.

D. riding on a skateboard.

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The sum of balanced forces equals

zero

.

one.

two.

thre

e.

0% 0%0%0%

A. zero.

B. one.

C. two.

D. three.

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The head of the arrow representing a force indicates the

A.

size

of t

he fo

rce.

stre

ngth

of the

forc

e.

dire

ctio

n of t

he fo

rce.

sum

of t

he fo

rces

.

0% 0%0%0%

A. size of the force.

B. strength of the force.

C. direction of the force.

D. sum of the forces.

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A standoff in an arm-wrestling match is due to

slid

ing fr

ictio

nal f

orce

s.

rolli

ng fri

ctio

nal fo

rces

fluid

fric

tional

forc

es.

bal

ance

d forc

es.

0% 0%0%0%

A. sliding frictional forces.

B. rolling frictional forces

C. fluid frictional forces.

D. balanced forces.

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The combination of two forces exerted in opposite directions is

the

sum

of t

he tw

o forc

es.

diff

eren

ce b

etw

een t.

.

pro

duct o

f the

two f.

..

ratio

of t

he tw

o forc

es.

0% 0%0%0%

A. sum of the two forces.

B. difference between the two forces.

C. product of the two forces.

D. ratio of the two forces. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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If there is an unbalanced force in an arm-wrestling match,

both

arm

s w

ill m

ove

i...

both

arm

s w

ill m

ove

i...

the

arm

s will

move

i...

the

arm

s will

be

stat

i...

0% 0%0%0%

1. both arms will move in the direction of the smaller force.

2. both arms will move in the direction of the larger force.

3. the arms will move in opposite directions.

4. the arms will be stationary.

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The first law of motion states

0%

0%

0%

0% A. that an object at rest will remain at rest.

B. that an object in motion will remain in motion at a constant velocity.

C. that an unbalanced force can change the velocity of an object in motion.

D. all of the above.

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The law of motion that describes action-reaction is the

0%0%0%0%

first law. second law. third law. law of gra...

1. first law.

2. second law.

3. third law.

4. law of gravity.

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Gravitational force between two objects depends on the

0%0%0%0%

masses of the obj... mass of each obje...

distance between ... inertia and masse...

A. masses of the objects and the distance between them.

B. mass of each object only.

C. distance between the objects only.

D. inertia and masses of the objects.

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A mass of 5 kg has a weight of

0%

0%

0%

0% A. 5 kg m/sec/sec.

B. 5 N.

C. 49 kg m/sec.

D. 49 N.

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If you were on the moon, there would be a change in your

0%

0%

0%

0% A. weight and mass.

B. weight.

C. mass.

D. volume.

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A force

0%

0%

0%

0% A. is a push or a pull.

B. gives energy to an object.

C. can cause an object to change its motion.

D. can do all of the above.

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