Study Physics Chp. 12 Review Flash Cards

 
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Physics Chp. 12 Review

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If you have an object hanging at rest from a spring, what do you know about the forces on it?
They cancel (the spring force up must equal the weight down)
How many nodes and antinodes does first standing wave pattern have? The second? The third?
1st: two, one
2nd: three, two
3rd: four, three
What are antinode?
Points in a standing waves that have maximum displacement (they just flip back and forth)
What are nodes?
Points in a standing wave that don't move
What are standing waves?
Waves formed by interference that don't appear to move
When does Destructive Interference occur?
When the crest of one wave overlaps with the trough of another
What is Destructive Interference?
When two waves interfere to form a smaller wave or no wave at all
When does Constructive Interference occur?
When the crest of one wave overlaps with the crest of a second wave (or trough to trough)
What is Constructive Interference?
When two waves interfere to form a bigger wave
What is interference?
When two waves overlap and form a new wave
What two equation can you use to find the speed of a wave?
v = ∆x/∆t
v = λf
What are the parts of a wave?
amplitude, wavelength, crest, trough, equilibrium, frequency, period, wave speed.
What's the difference between longitudinal and transverse waves?
longitudinal: particles move side to side (parallel to the direction of travel)
transverse: particles move up and down (perpendicular to the direction of travel)
What is the difference between a pulse wave and a periodic wave?
pulse is only one wave
periodic is more than one wave
For a simple harmonic oscillator where is the smallest
a. force?
b. acceleration?
c. speed?
a. at equilibrium
b. at equilibrium
c. when it is farthest from equilibrium
For a simple harmonic oscillator where is the greatest
a. force?
b. acceleration?
c. speed?
a. when it is farthest from equilibrium
b. when it is farthest from equilibrium
c. at equilibrium
What is the formula that gives the period of a mass connected to a spring?
T = 2π√(m/k)
What is the formula that gives the period of a pendulum?
T = 2π√(l/g)
What is the symbol for period? What are the units of period?
symbol: T
units: s ( or any other time units)
What is the definition of period?
time/cycle (for a simple harmonic oscillator)
or
time/waves (for waves)
What are the units of frequency?
hz
What is the definition of frequency?
cycles/time (for a simple harmonic oscillator)
or
waves/time (for waves)
What is simple harmnoic motion?
A back and forth motion that is the result of a restoring force
What does Hooke's Law tell us?
F = -kx
1. force increases with displacement from equilibrium (x)
2. the force is in the opposite direction of the displacement (-)
3. the force depends on the stiffness of the spring (k)
What is the formula for Hooke's Law?
F = -kx
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