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physical science > unit 3 test > Flashcards

unit 3 test Flashcards

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1
Q

a push or pull

A

force

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2
Q

this type of force can change the movement of an object

A

applied force

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3
Q

the sum of all the forces acting on an object

A

net force

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4
Q

true or false: forces have direction

A

true

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5
Q

what SI unit is force measured in

A

newtons (N)

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6
Q

the rules of adding forces

A
  • add forces in the same direction
  • subtract forces in opposite directions
  • forces not in the same direction or in opposite directions can’t be directly added together
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7
Q

a force applied in one direction is greater than the force applied in the opposite direction (doesn’t change in motion)

A

balanced force

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8
Q

the force that opposes the sliding motion of 2 surfaces that are touching each other

A

friction

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9
Q

source of friction

A

microwelds

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10
Q

what must be applied ts break microwelds.

A

force

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11
Q

prevents 2 surfaces from sliding past each other

A

*static friction

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12
Q

opposes the motion of 2 sunfaces sliding past each other

A

*sliding friction

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13
Q

what causes sliding friction

A

microworlds constantly breaking and forming as the objects slide past each other

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14
Q

as wheels roll, static friction acts over the area where the wheel & surface are in contact

A

rolling friction

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15
Q

-an attractive force between any 2 objects that depends on the masses of the objects and the distance between them

A

gravity

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16
Q

“relationship between the gravitational force between 2. objects, the object’s masses, and the distance between them

A

the law of universal gravitation:

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17
Q

gravitational force _____ as the mass of either object ______ and the objects move closer

A

increases; increases

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18
Q

true or false: gravity is a low range force

A

true

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19
Q

region of space that has a physical quantity at every point

A

field

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20
Q

true or false all object sunnounded by grenitational field

A

true

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21
Q

how to measure strength of gravitational field (g)

A

newtons per kilogram (N/kg)

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22
Q

gravitational force exerted on an object

A

*weight-

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23
Q

*weight equation:

A

N = Kg× N/ Kg
fg=mg

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24
Q

true or false weight increases as mass increenses

A

true

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25
Q

cell phone

A

IN

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26
Q

backpack w books

A

100 N

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27
Q

jumbo jet

A

3.4 m N

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28
Q

true or false

A

the weight of an object cam change depending on the gravitational fore on the object

29
Q

states that-an object moves at a constant velocity unless an unbalanced
force acts on it

A

newton’s first law of motion:

30
Q

nwetons first law basically says that

A
  • moving object will move a constant velocity unless unbalanced force acts on it
31
Q

tendency of an object to nesist any change in its motion

A

inertia-

32
Q

true/false amount of object’s inertia is related to mass

A

true

33
Q

rue / false greater mass, greater chertia.

A

true

34
Q

the forces exerted an an dbject, its mass, and its acceleration ale related

A

newton’s second Law of motion

35
Q

velocity divided by time it takes for change to occur

A

*acceleration

36
Q

the acceleration of an object depends on

A

its mass t the force exerted on it

37
Q

*force has ____ and ____

A

size & direction

38
Q

when one object exerts a force on a second object, the second object exerts a force on the first that is equal in strength and opposite in direction

A

newtons 3 law of motion:

39
Q

forces are interactions…

A

between objects

40
Q

2 objects r different masses, still feel the…

A

same size force

41
Q

friction-like force that opposes the motion of objects that move through the ain

A

air resistance

42
Q

maximum speed an object will reach when falling through a substance, such as air

A

terminal velocity

43
Q

when gravity is the only force acting on an object

A

free fall

44
Q

force exerted toward the center of a curved path

A

centripetal force

45
Q

if no external forces act on a group of objects, their total momentum does not change

A

*law of conservation of momentum-

46
Q

objects appear to be ___ in free fall

A

weightless

47
Q

air resitance moves directly ____ to motion of object in the air

A

opposite

48
Q

air resistance ____ ans objects speed ____

A

increases; increases

49
Q

net force ____ as object falls

A

decreases

50
Q

terminal velocity depends on _____, _____, and ____

A

size; shape; mass

51
Q

to describe velocity, you need to know

A

speed and direction

52
Q

is the distance & direction of an object’s change in position from the starting point

A

displacement

53
Q

when you graph the motion of an object, you put ____ on the horizontal axis and ____ on the vertical axis.

A

time; distance

54
Q

is a condinate system in which the positions of objects can be measured

A

reference point

55
Q

Vf

A

final velocity

56
Q

occurs with change of speed or direction or both

A

acceleration

57
Q

the distances direction of anobject’s change in position from the starting point

A

displacement-

58
Q

can either be a change in how fast smth is moving or a change in direction

A

change in velocity

59
Q

______ has the same direction as velocity

A

momentum

60
Q

when the _____ of an object changes, the object is accelerating

A

velocity

61
Q

is the total distance troveled divided by the total time traveled

A

average speed

62
Q

the product of an object’s mass & velocity

A

momentum

63
Q

speed of object & direction of motion

A

velocity

64
Q

rate of change of the velocity of an object

A

acceleration

65
Q

the r.o. c. in position @ given point in time

A

*instantaneous speed

66
Q

distance an object travels dovided by the time of travel

A

speed

67
Q

the r.o, c. of an objectls position

A

speed

68
Q

any change over time

A

rate

physical science (9 decks)

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