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science test 2/27 Flashcards

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1
Q

Centripetal force

A

a center-directed force that continuesly changed the diretion of an object – moves in a circle

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2
Q

what was newtons law of univeral gravitation state

A

that every object in the universe attracts every other object

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3
Q

gravitational force

A

an attraction force acts between any two masses

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4
Q

what is the weekest gravitational force

A

gravity

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5
Q

weak unclear force

A

attractive force that acts only over a short range

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6
Q

strong nuclear force

A

a powerful force of attraction that only on the neutrons and protons in the nucleus, holding them together

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7
Q

the weak nuclear force is involved in certain types _____ process

A

radioactive

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8
Q

the strong nuclear forces overcomes the ___ force of the replusion that acts among the ___ in the nucleas

A

electric, protons

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9
Q

what acts within in the nucleas to hold it together

A

the strong and weak nuclear force

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10
Q

magenetic forces act ob ___ metals on the ___ of the magnets, and on ____ charges

A

certain, poles, moving

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11
Q

objects with like charges

A

repel

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12
Q

Objects with oppsite changes like positive and negative, they

A

attract on another

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13
Q

electric force and magnetic force are the only forces that can both ___ and ____

A

attract, repel

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14
Q

electromagnetic force

A

associated with change particles

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15
Q

a closed system

A

the loss of momentum of one object equals the gain in momentum of another momentum is conserved

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16
Q

how is momentum measure

A

units of kilogram- meters per second

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17
Q

momentum forumula

A

momentum = mass x velocity

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18
Q

momentum depends on

A

mas and velocity

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19
Q

momentum

A

the producr of an objects mass and velocity

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20
Q

when equal and opposite forces act is it

A

0

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21
Q

action and reaction forces are equal in __ and opposite in ___

A

size, force

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22
Q

what are the two forces in newtons law

A

action and reaction forces

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23
Q

what is newtons third law

A

whenever one motions ecerts force on a second object, the second object exerts an equal and opposite force

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24
Q

forces ____ exist and paris

A

always

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25
Q

a force ___ can exist alone

A

cannot

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26
Q

weight is a measure of the force of ___ acting on an object

A

gravity

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27
Q

mass is a measure of the ____ of an object

A

inertia

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28
Q

doubling the mass of an object also doubles the

A

weight

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29
Q

what unit is mass in

A

kilograms

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30
Q

accerlation and gravity are

A

meter per second

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31
Q

force and weight are in

A

newtons

32
Q

weight formula :

A

mass x acceleration

33
Q

weight

A

the force of gravity acting upon an object

34
Q

newtons second law

A

accelration _ netforce / mass or a=f/m

35
Q

mass

A

the measure of the interia of an object

36
Q

the accerleration of an object depends on its

A

masss

37
Q

unbalanced forces cause objects to change

A

velocity

38
Q

intertia

A

the tendancy of an objects reists to change in its motionn

39
Q

newtons first law can be called

A

intertia

40
Q

the state of motion does not change as long as the netforce acting on the object is

A

0

41
Q

newton

A

summerized his study of force and motion in several laws of motion

42
Q

air resisrance and gravity are the only forces acting on

A

projectile

43
Q

projectile motion

A

a curved path, the motion of a falling object

44
Q

terminal velocity

A

the constant velocity of a falling object when the force of air resistance

45
Q

as an object falls to the ground for a long time the ___ force of air resistance becomes __ to the downward force of ___

A

upward, equal

46
Q

as objects fall to the ground they ___ and ___ speed

A

accerlate, gain

47
Q

air resistance acts in the direcrion ___ to the motion and ___ acceleration

A

opposite, reduces

48
Q

what 2 things can affect the motion of falling object

A

gravity and air resistance

49
Q

earths gravity acts ___ toward the center of the earth

A

downaward

50
Q

gravity can act over ___ disatnce

A

large

51
Q

gravity can act over ____ distances

A

large

52
Q

gravity

A

a force that acts between any two masses

53
Q

air resistance

A

fluid friction acting on an object moving through the air

54
Q

fluid friction

A

opposes the motion of an object through a fluid

55
Q

rolling friction

A

the friction force that acts on a rolling ojbect

56
Q

because sliding friction is less than startic friction,

A

less force is needed

57
Q

sliding friction

A

a force that opposed the direction of motion an object as it slides over a surfaces

58
Q

static friction always acts in the direction ___ to that applied force

A

opposite

59
Q

static friction

A

the friction force that acts on objects that are not moving

60
Q

what are the four main types of friction

A

static, sliding, rolling, fluid

61
Q

friction acts at the surface where objects are in

A

contact

62
Q

friction

A

a force that opposes the motion of objects that touch as they move pass each other

63
Q

all moving forces are subject to

A

friction

64
Q

forces acting in opposite direction can also combine to produce

A

an unbalanced force

65
Q

what happens when an unbalnced force acts on an object

A

the object acclerates

66
Q

there are no changes in the objects motion when the net force is

A

0

67
Q

blanced forces are combined to produce a net force of

A

0

68
Q

net force

A

the overall force after all the forces combined

69
Q

can forces be combined

A

yes

70
Q

what can you use to represent the direction and strength of a force

A

an arrow

71
Q

who is sir issac newton

A

newton is named after him, english scientist who explained how force, mass, and acceeration are related

72
Q

1 newton is equal to

A

1 kilogram-meter per second squared

73
Q

one newton

A

the force that causes a 1- kilogram mass to accerates at a rate of 1 meter per second each second

74
Q

force is measured in

A

newton

75
Q

forces are often ___ to measure

A

easy

76
Q

forces can causse a resting object to move, or it can a ___ moving, object by changing the objects ___ or ___

A

accelerate, speed, or direction

77
Q

force

A

a push or pull that acts on an object

science (8 decks)

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