Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics 1 > test 2 > Flashcards

test 2 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

which is fundamental, mass or weight

A

mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what does weight depend on

A

gravitational acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

which one is a force, mass or weight

A

weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

which one changes if you go from earth to moon, mass or weight

A

weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

which one stays the same, mass or weight

A

mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

normal force

A

perpendicular interaction between surface and object
- when surface changes, so does normal force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how do we find normal force

A

summing forces in the actual or rotated Y direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what does normal force =

A

support force
- this is how you experience weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how can you weight change

A

because it is a result of summed forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

how do you determine weight

A

based on normal force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

lbs

A

measure of weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

kg

A

measure of mass (fundamental)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what are the 4 elevator cases

A
  1. stationary
  2. acc. up
  3. acc. down
  4. cable snaps
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

acc. up

A

n=w+may
velocity is down and want to slow down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

acc. down

A

n=wmay
velocity is up and want to slow down
- you feel lighter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

when the cable snaps, what is the force that is acting

A

only gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

as you move up and down in the elevator, why does weight change

A

because of acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

when objects are connected by string under tension, how do they move

A
  • must move together
  • have same acceleration
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

when deal with frictionless pulleys, the tension in the rope is what, causing the system to what

A
  • tension is same
  • system move together
  • have same acceleration
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what are some example scenarios of equilibrium

A
  • stationary
  • static
  • not moving
  • at rest
  • constant speed
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

what does acceleration equal during equilibrium

A

0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

if in equilibrium, then forces pointing right=

A

all forces pointing left

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

if in equilibrium, all forces pointing up=

A

all forces pointing down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what does static friction have

A

max value of usn

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Fs

A

static friction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

if forces added together pointing right are larger than all forces added together pointing left, what happens to the object

A

accelerates to the right

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

if left sum is larger than right sum, what happens to object

A

accelerates to left (negative direction)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

what are the three types of friction

A

static
dynamic
rolling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

which type of friction is for stationary objects

A

static standing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

which type of friction is for object sliding across surface

A

dynamic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

which friction force is smaller for rolling or sliding object

A

rolling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

what two quantities does friction force depend on

A

normal and coefficient of friction

33
Q

what quantity is determined by two materials in contact with each other

A

coefficient of friction

34
Q

static friction

A
  • opposes net force on the object if object is not in motion
    fs<usn
    fsmax=usn
35
Q

kinetic friction

A

opposes velocity vector if object is in motion
fk=ukn

36
Q

can you have mutliple types of friction working at a time

A

no, can only have 1

37
Q

coefficient of static or kinetic

A
  • dimensionless number
  • property of 2 materials in contact (object and surface)
38
Q

friction

A

parallel interaction between object and surface

39
Q

when does static become friction

A

static will match number until pull is at the max value

40
Q

Fp>Fsmax

A

object is moving

41
Q

inertial drag

A

object moving through fluid had to physically move atoms out of way
Re>1000

42
Q

viscous drag

A

material in liquid is sticking to object so slowing object down
- viscosity of fluid
- Re<1

43
Q

Cd

A
  • form factor of object
  • related to shape of object
  • squares are bad because they catch more air
  • pointy objects have better Cd
44
Q

moving up

A

negative

45
Q

moving down

A

positive

46
Q

terminal speed

A
  • when mg=0 or ay=0
  • object stops accelerating because velocity is fixed
47
Q

when moving in a circle at a constant speed, what should cancel

A

mass

48
Q

what acceleration is responsible for changing direction of velocity vector

A

centripetal or radial

49
Q

when summing forces in radial direction, which direction is that

A

towards center

50
Q

what holds a car in a circular path when making a turn

A

static friction

51
Q

what happens to car if force is not large enough

A

will slide out of path

52
Q

period

A

T
- time required for one complete cycle

53
Q

frequency

A

number of events that occur per second
- measured in Hz

54
Q

angular speed

A
  • omega
  • how quickly something rotates
55
Q

centripetal acceleration

A

velocity changes requires acceleration
- directional change only
- points toward center of curve

56
Q

what does size of acceleration depend on for centripetal acceleration

A

how fast your going and size of turn

57
Q

towards center

A

positive

58
Q

away from center

A

negative

59
Q

nickname for third law

A

law of action
- reaction or law of interaction

60
Q

what are the action/reaction pairs

A

the two forces that are equal and opposite

61
Q

newtons third law

A

interaction is between one thing and another and require a pair of forces action on two objects
- things happen in pairs

62
Q

what is an example of newtons third law

A

interaction of hand and wall pushing on each other

63
Q

weight

A

force of gravity acting on object
- acts in negative Y

64
Q

spring

A

Fs=|kx|

65
Q

tension

A

FT
- string
- rope
- cable
- acts along rope

66
Q

inertia

A

tendency of object to resist any attempt to change its velocity

67
Q

what is newtons first law of motion

A
  • law of inertia
  • every object continues in its state of rest/uniform speed in straight line as long as no net force acts on it
68
Q

what is a force

A
  • push or pull in an object
  • causes velocity to change
  • vector
  • causes acceleration
69
Q

what is newtons second law

A
  • law of acceleration
    F increases, a decreases
    m increases, a decreases
70
Q

what are the units for Big G

A

N m^2/kg^2

71
Q

who first measured Big G

A

Henry Cavendish

72
Q

how does gravity change inside a planet

A

decreases linearly

73
Q

the orbital velocity need to maintain orbit depends on what factors

A

mass of main body and distance from its center
- does not depend on mass

74
Q

does matter repulse

A

no, all matter attracts other matter

75
Q

G

A

universal gravity constant
G=6.67x10^-11

76
Q

mass increases, what happens to gravity

A

force gravity increases

77
Q

as mass of one object goes up, what happens to force between them

A

also goes up (linear)

78
Q

as distance between objects goes up, what happens to force of attraction

A

goes down (inverse square)

79
Q

orbit

A

constant state of free fall

Physics 1 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions