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PHYS 1111 > TEST 2- Key Things to Remember > Flashcards

TEST 2- Key Things to Remember Flashcards

(108 cards)

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1
Q

W TOT =

A

ΔKE = Fd

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2
Q

Conservative

A

path independent

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3
Q

Conservative examples

A

gravity and spring

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4
Q

Nonconservative examples

A

friction, air resistance, tension, muscles and motor

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5
Q

W A->B =

A

fk x d cos angle

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6
Q

W Xi->Xf =

A

fg x d cos angle

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7
Q

Potential energy

A

new form change in “stored” kinetic energy, U

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8
Q

Ball is thrown up

A

force of gravity does negative work and decrease in kinetic energy

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9
Q

When ball is thrown up Wg =

A

-mgh

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10
Q

When ball is thrown up ΔKE =

A

-mgh

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11
Q

When ball travels down

A

force of gravity does positive work and increase in kinetic energy

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12
Q

When ball travels down Wg =

A

+mgh

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13
Q

When ball travels down ΔKE =

A

+mgh

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14
Q

Spring is displaced and then released Ws =

A

-1/2kΔx^2

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15
Q

Spring is displaced and then released ΔKE =

A

-1/2kΔx^2

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16
Q

Spring is displaced and then released

A

increase in negative work, decrease in kinetic energy

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17
Q

Block compresses spring and pushes back to equilibrium Ws =

A

+1/2kΔx^2

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18
Q

Block compresses spring and pushes back to equilibrium ΔKE =

A

+1/2kΔx^2

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19
Q

Block compresses spring and pushes back to equilibrium

A

decrease in negative work and increase in kinetic energy

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20
Q

You find where U

A

= 0

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21
Q

For conservative, ΔUF conservative =

A

-WF conservative

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22
Q

Nonconservative ΔKE =

A

W conservative + W non conservative

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23
Q

Work non conservative =

A

ΔKE + ΔU or ΔME

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24
Q

In conservative, ΔME =

A

ΔME i = ΔME f

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25
ΔUg =
-Wg
26
Ug(h) =
mgh
27
ΔUs =
-Ws
28
ΔUs(Δx) =
1/2kΔx^2
29
Fk =
μk x Fn
30
Static friction fs =
F push, fs, max = μs x Fn
31
Coefficient of Static friction is < > than kinetic
>
32
Stronger K
larger K
33
More stretch
more force
34
Spring force direction
opposite ΔX, pull back to equilibrium
35
Fs =
-kΔx
36
Tension force
in both directions with equal magnitude
37
Centripetal acceleration
|| a || = V^2 / R (a direction)
38
W =
F x d cos angle
39
Positive work
force and displacement in same direction (angle < 90)
40
Negative work
force and motion in opposite direction (angle > 90)
41
Zero work
angle = 90
42
Angle = 0, work
greatest positive work, force and displacement parallel
43
Angle = 180, work
greatest negative work, force and displacement anti-parallel
44
Pulleys change
direction not magnitude
45
Spring force =
Fx = -kx
46
Increasing force and increasing difference
increase in work
47
W total = positive, speed
increases, directly related
48
Kinetic energy is never
negative
49
Power =
work (or fd) / time in Watts
50
Power is directly proportional to
force and speed
51
Velocity =
square root of 2gh
52
Linear momentum =
mass x velocity in kg x m/s
53
Newtons second law and linear momentum
net force = ma = ΔP/Δt
54
Impulse =
FaverageΔt
55
Linear momentum is
conserved =0
56
Internal momentum
equal and opposite =0
57
External momentum
may not =0
58
Angular position
θ
59
Reference line θ
θ = 0
60
I revolution =
360 degrees = 2pi rad
61
Radian
dimensionless, angle the arc length on circle with radius r
62
Arc length equation
s = rθ
63
Angular velocity symbol
w
64
Angular position θ values
θ < 0 clockwise θ > 0 counter clockwise
65
w av =
Δθ / Δt in rad/sec
66
Angular velocity values
w < 0 clockwise w > 0 counter clockwise
67
Angular speed
magnitude of angular velocity
68
T
period, one revolution
69
Angular acceleration aav =
Δw / Δt in rad/sec^2
70
Linear x =
Angular θ
71
Linear v =
angular w
72
Linear a =
angular a
73
Tangental angular velocity
vt = 2pi r / T = rw
74
Centripetal acceleration acp
acp = rw^2
75
Tangental acceleration at
at = ra in m/s^2
76
Rolling motion is
translational, both rotational and linear
77
Rolling without slipping v =
rw
78
Translational speed of axle
V = rw = vt
79
Rolling motion rim of wheel has instantaneous speed
0 at ground and 2v at top
80
Angular kinetic energy =
K = 1/2 (mr^2)w^2
81
Farther mass from axis means
increase velocity and kinetic energy
82
Rotational mass also known as
moment of inertia I
83
I =
mr^2, increases with increase rotational kinetic energy
84
I = sum of
mi (ri)^2 in kg x m^2
85
Moment of inertia for hoop
I = MR^2
86
Moment of inertia for disk
I = 1/2MR^2
87
Linear m =
angular I
88
Linear K =
angular 1/2Iw^2
89
Inertia increases
resistance to change in angular velocity increases
90
Conservation of energy K =
1/2mv^2 ( 1 + 1/mr^2 )
91
Degrees to radians
angle degree / 360 x 2pi
92
Tangenital acceleration
remains the same no matter the angular speed
93
In collisions, if Pf does not Pi
the collisions is physically possilbe
94
In collisions, if Vf are not equal for both objects
cannot be perfectly inelastic
95
You know on an incline plane that
Gravity will be an external force
96
Reminder Newton's 2nd law
F = ma
97
X-axis direction in rotational motion
toward center
98
Y-axis direction in rotational motion
parallel to rotating object's direction of motion
99
On incline plane, when are sin and cos used
sin is x axis, cos is y axis (cos is into plane)
100
Centripetal acceleration
in x direction
101
Tangential acceleration
in y direction
102
Tangential acceleration in same direction as velocity vector
object is speeding up
103
Rolling motion occurs without
slipping
104
Do masses closer or further have higher translational velocities
further
105
If an object is rotated about a point with mass
When calculating I, the radius is 0 The radius of the other objects should be connected to the point of rotation
106
Conservative Forces result in
potential energies
107
Net torque due to gravity is = to
torque from total gravitational force acting at the position of object's center of mass
108
Static Equilibrium
net force and net torque are both 0 and an object does not accelerate

PHYS 1111 (4 decks)

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