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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) |
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noblejas Thu, 24 Jan 2008 20:04:17 GMT |
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| How many nodes and antinodes does first standing wave pattern have? The second? The third? |
1st: two, one
2nd: three, two
3rd: four, three |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What are antinode? |
Points in a standing waves that have maximum displacement (they just flip back and forth) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What are nodes? |
Points in a standing wave that don't move |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What are standing waves? |
Waves formed by interference that don't appear to move |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| When does Destructive Interference occur? |
When the crest of one wave overlaps with the trough of another |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is Destructive Interference? |
When two waves interfere to form a smaller wave or no wave at all |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| When does Constructive Interference occur? |
When the crest of one wave overlaps with the crest of a second wave (or trough to trough) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is Constructive Interference? |
When two waves interfere to form a bigger wave |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is interference? |
When two waves overlap and form a new wave |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What two equation can you use to find the speed of a wave? |
v = ∆x/∆t
v = λf |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What are the parts of a wave? |
amplitude, wavelength, crest, trough, equilibrium, frequency, period, wave speed. |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| 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) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the difference between a pulse wave and a periodic wave? |
pulse is only one wave
periodic is more than one wave |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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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 |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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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 |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the formula that gives the period of a mass connected to a spring? |
T = 2π√(m/k) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the formula that gives the period of a pendulum? |
T = 2π√(l/g) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the symbol for period? What are the units of period? |
symbol: T
units: s ( or any other time units) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the definition of period? |
time/cycle (for a simple harmonic oscillator)
or
time/waves (for waves) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What are the units of frequency? |
hz |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the definition of frequency? |
cycles/time (for a simple harmonic oscillator)
or
waves/time (for waves) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is simple harmnoic motion? |
A back and forth motion that is the result of a restoring force |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| 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) |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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| What is the formula for Hooke's Law? |
F = -kx |
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noblejas Thu, 24 Jan 2008 20:00:09 GMT |
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