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physical science > unit 3 test > Flashcards

unit 3 test Flashcards

(68 cards)

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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
cell phone
IN
26
backpack w books
100 N
27
jumbo jet
3.4 m N
28
true or false
the weight of an object cam change depending on the gravitational fore on the object
29
states that-an object moves at a constant velocity unless an unbalanced force acts on it
newton's first law of motion:
30
nwetons first law basically says that
- moving object will move a constant velocity unless unbalanced force acts on it
31
tendency of an object to nesist any change in its motion
inertia-
32
true/false amount of object's inertia is related to mass
true
33
rue / false greater mass, greater chertia.
true
34
the forces exerted an an dbject, its mass, and its acceleration ale related
newton's second Law of motion
35
velocity divided by time it takes for change to occur
*acceleration
36
the acceleration of an object depends on
its mass t the force exerted on it
37
*force has ____ and ____
size & direction
38
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
newtons 3 law of motion:
39
forces are interactions...
between objects
40
2 objects r different masses, still feel the...
same size force
41
friction-like force that opposes the motion of objects that move through the ain
air resistance
42
maximum speed an object will reach when falling through a substance, such as air
terminal velocity
43
when gravity is the only force acting on an object
free fall
44
force exerted toward the center of a curved path
centripetal force
45
if no external forces act on a group of objects, their total momentum does not change
*law of conservation of momentum-
46
objects appear to be ___ in free fall
weightless
47
air resitance moves directly ____ to motion of object in the air
opposite
48
air resistance ____ ans objects speed ____
increases; increases
49
net force ____ as object falls
decreases
50
terminal velocity depends on _____, _____, and ____
size; shape; mass
51
to describe velocity, you need to know
speed and direction
52
is the distance & direction of an object's change in position from the starting point
displacement
53
when you graph the motion of an object, you put ____ on the horizontal axis and ____ on the vertical axis.
time; distance
54
is a condinate system in which the positions of objects can be measured
reference point
55
Vf
final velocity
56
occurs with change of speed or direction or both
acceleration
57
the distances direction of anobject's change in position from the starting point
displacement-
58
can either be a change in how fast smth is moving or a change in direction
change in velocity
59
______ has the same direction as velocity
momentum
60
when the _____ of an object changes, the object is accelerating
velocity
61
is the total distance troveled divided by the total time traveled
average speed
62
the product of an object's mass & velocity
momentum
63
speed of object & direction of motion
velocity
64
rate of change of the velocity of an object
acceleration
65
the r.o. c. in position @ given point in time
*instantaneous speed
66
distance an object travels dovided by the time of travel
speed
67
the r.o, c. of an objectls position
speed
68
any change over time
rate

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