# Reading Quiz 25 Key

## Due 3:30 pm, Tuesday, December 1st

Physics 105, Fall Term, 2009

Did you complete the reading assignment?

Yes
No

## KEY CONCEPTS:

1) Simple harmonic motion is a motion that repeats in a simple pattern.

2) When the location and time of an object undergoing simple harmonic motion is graphed, it produces a sine curve.

To visualize simple harmonic motion, go to: http://positron.ps.uci.edu/~dkirkby/music/html/demos/SimpleHarmonicMotion/index.html. Click through each of the links; watch the animations and read the text.

What do the motions of the spring, pendulum, and orbit have in common?

What kind of curve is made by graphing the position of these objects in these systems compared to time? (Hint: look at key concept #2)

Does the amplitude, or maximum displacement from the center, of the motion for these objects change?

Yes
No

Define simple harmonic motion.

Which of the following is an example of simple harmonic motion (select all that apply):

A skateboarder in a half pipe
A fan blade while the fan is running
A guitar string after it is plucked
The motion of this koala (roughly)
A swimmer holding a constant pace for each lap of the pool

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Was there anything that you didn't understand in the reading assignment?  What was confusing to you?