# Physics 120/130

## Simple
Harmonic Motion

##

From
this general outline, please investigate the following using methods you have
learned about in previous labs and write up a full report being careful to
explain yourself fully.

__Apparatus__

Spring, weight hanger, set of masses, digital balance, meter stick,
stopwatch, and sonic ranger.

__Outline__

You will investigate the following items using the techniques and methods
learned in previous labs and write a full lab report, including the procedure
you developed and used.

1. By hanging known weights from the spring, determine k. I**s the plot
linear? Do you expect it to be?**

2. Measure the periods of oscillation for different initial amplitudes and
determine whether T depends on A. This determination should be quantitative (a
number).

3. Experimentally determine (with graphs) how the position, velocity, and
acceleration of a mass on a spring depend on time. Note: this is not the same
thing as part 2. **Do these graphs represent the motion in the ways you expect?**

4. Experimentally determine (with a graph) how the amplitude of a mass on a
spring depends on time. Note: this is not the same thing as part 2 or part 3.

5. Since the mass we use and the spring are both hanging and subject to
gravity, we may have to consider gravity's effect. It turns out that we can
"ignore" gravity acting on the hanging mass. **Why?** If the mass
of the spring is negligibly small compared to the mass attached to the spring,
then the period is given by
. To account for the effect of the mass of the spring, however, we need
to add the spring's mass into the formula for the period,
, where m_{s} is the mass of the spring and a
is a constant, *not an angular acceleration.* **Measure the period
of oscillation for different masses m. What are the units of a?
Determine k and a from your measurements. This method
should be independent of the k you found in part 1. You should also make sure to
report a and k properly.**

You have access to: a spring, weight hanger, set of masses, digital balance,
meter stick, stopwatch, note cards, photogate, and sonic ranger.