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PHYS 1111 > LAB EXAM > Flashcards

LAB EXAM Flashcards

(74 cards)

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1
Q

On incline plane

A

cos is into plane
sin is across plane

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2
Q

If adding or subtracting, how many sig figs

A

same number of decimal places, if 0 still write out whole number before decimal

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3
Q

Length of caliper steps

A

1- Find point of alignment on bottom and top
2- Find actual measurement (line far to the left on bottom)
3- Use the top scale to find to one decimal place
4- count from alignment to actual and use bottom scale to find second decimal place

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4
Q

Percent error

A

% error = experimental - exact / exact x 100

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5
Q

Percent difference

A

% difference = |measurement 1 - measurement 2| / 1/2 (measurement 1 + measurement 2) x 100

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6
Q

How does the detector measure position of glider

A

detector is pointed directly at glider track to make accurate

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7
Q

If glider is moved up

A

graph shifts up

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8
Q

How do you determine whether the air track is level

A

when the glider is placed on the track and there is no movement

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9
Q

Two sources of friction on the glider

A

air resistance
metal track

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10
Q

How could you make the glider move with constant acceleration

A

the button on glider or start on logger pro and glider are pushed at the same time
reduce friction

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11
Q

3 ways to control acceleration

A

tilt track, steeper=faster
heavy object is placed on glider, more mass = faster
powerful spring on the end of the track

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12
Q

How many graphs per page

A

1 labeled with clear data points

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13
Q

When drawing line of best fit

A

use a ruler to draw a smooth line

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14
Q

Keep the line of best fit

A

between data set, do not extend beyond

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15
Q

When picking slope points

A

do not pick points outside of data set
do not use actual data points to determine slope (use line of best fit)

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16
Q

Force vs. Acceleration which is y and which is x

A

Y = Force
X = Acceleration

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17
Q

Formula for slope

A

y2 - y1 / x2 - x1 (use units to find slope units)

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18
Q

Motion with constant acceleration F =

A

F = ma = mgsinθ

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19
Q

Distance versus time graph velocity

A

velocity is the slope

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20
Q

Distance versus time graph acceleration

A

Concave up means positive acceleration
Concave down means negative acceleration
Acceleration = 0 if straight line

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21
Q

Constant velocity means

A

0 accleration

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22
Q

y = A + Bx + Cx^2

A

A: initial position
B: initial velocity
C: 1/2 acceleration

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23
Q

What equation can y = A + Bx + Cx^2 be compared to

A

Y = Y0 + V0t + 1/2at^2

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24
Q

Tan

A

y/x

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25
Ax =
Ax = Acosθ
26
Ay =
Ay = Asinθ
27
C =
A + B Cx = Ax + Bx Cy = Ay + By
28
Which method is more accurate analytical or graphical
Analytical because less errors Graphs need to be drawn exactly to scale
29
What angle was the resultant weight placed using the table with the hanging weights
180 from resulting angle to balance weights A and B
30
a = (with constant and friction)
a = m2g +- Ff / (m1 +m2)
31
Newton's second law
sum of all forces = mass * net acceleration
32
Connected objects in a hanging system
same velocity, same acceleration, same tension
33
Friction opposes
motion
34
If hanging mass is moving upwards (velocity and acceleration)
hanging object velocity and acceleration point up mass on table shows velocity and acceleration to the left
35
If hanging mass is moving upwards
mass on table friction points to the right because it is moving to the left
36
If hanging mass is moving down
opposite of moving up
37
Hanging mass system acceleration moving up
a'
38
Hanging mass system acceleration moving down
a''
39
If no friction acceleration
a = m2g / m1 + m2
40
With friction acceleration
a = m2g +- Ff / (m1 + m2)
41
a' sign
+Ff because right
42
a'' sign
-Ff because left
43
Average frictional force on glider
a' - a'' = m2g +Ff / m1 + m2 - (m2g - Ff / m1 + m2) = 2Ff / m1 + m2 Ff = 1/2 (a' - a'')(m1 +m2)
44
ac =
ac = v^2 / r
45
MEi =
MEi = MEf
46
Spring F =
F = kx - mg = 0
47
What is the direction of centripetal force
always points towards the center of curvature same for centripetal force
48
Why was it important to keep the arrow to the center of saucer
reference point helps to ensure equilibrium
49
Equilibrium
sum to 0
50
What mass will feel the same force as the spinning mass
Fs = mg (weight) F = acp set equal
51
Purpose of ballistic pendulum lab
to solve for the initial speed of a projectile
52
Inelastic collision
stick together momentum is conserved kinetic energy is NOT conserved
53
Elastic collision
momentum is conserved kinetic energy IS conserved
54
After collision use
conservation of momentum
55
Before collision use
conservation of energy only applies to swing of pendulum itself
56
h =
(L)(1- cosθ)
57
Before collision what is 0
potential energy
58
After collision what is 0
kinetic energy
59
Where is spring at maximum displacement from equilibrium
peak or valley
60
at peak or valley is velocity a max or min
minimum = 0 tangent line is horizontal
61
at peak or valley is force a max or min
maximum
62
at peak or valley is acceleration a max or min
maximum
63
at peak or valley is kinetic energy
miniumum
64
At equilibrium a =
a = 0
65
Period
one revolution makes graph symmetric
66
Slope of force vs. distance
spring constant N / m
67
Nodes
at equilibrium
68
Antinodes
anywhere at crest or trough
69
Number of nodes
= 1 + harmonic
70
Number of antinodes
= harmonic
71
Speed of string
c = square root S / u speed = square root tension (weight) / (mass/length)
72
Static equilibrium sum of forces
Fx = 0 Fy = N - m1g - m2g -mstick g Fz = 0
73
Torque =
Torque = Frsinθ
74
Momentum arm
rsinθ perpendicular distance from the line of action of the force to the axis of rotation

PHYS 1111 (4 decks)

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