Physics 121, Physics 201 Class 070822

Address for syllabus: http://vhmthphy.vhcc.edu/ > Physics I > homepage > Info > (look under

in-class section and click on syllabus for your course)

Text: Giancoli Physics text, latest edition (earlier editions

can also be supported)

Measure the washer: Measure the inner and outer diameters of your washer.

How did you measure the diameter?

What is the best way to measure the diameter using the materials

provided?

How accurately do you think the diameter could be measured using

these materials (e.g., to within what percent error do you think you

could measure the diameter)?

What is the maximum measurement you can get and what is the minimum for the

outer diameter of the washer?

What is the percent difference between these measurements?

The per cent difference between these measurements is the ratio of the
difference to the reference value of the measurement, with the ratio
expressed as a per cent.

If two measurements are considered equally valid, as is the case here,
then the reference measurement is the average of the two measurements.

For example if your two measurements are 3.7 cm and 3.3 cm, then the
difference is .4 cm. The average value of the two measurements is 3.5
cm, which we take as the reference measurement. The ratio of the
difference to the reference measurement is .4 cm / (3.5 cm) = .12, rounded
to two significant figures, or 12%.

Construct a pendulum and observe its period: Construct a pendulum and indicate the measurements you used to determine its

length from the knot in the string to the center of the washer.

Determine as accurately as possible how long it takes the pendulum to

complete a small swing. 'Small' means that the amplitude of the motion is not

greater than .1 of the length of the pendulum.

The period of the pendulum is the time required to swing from one extreme

position to the other and back.

Keep the details of your measurements in your lab notebook but on your initial

sheet report diameter, length and period.

Standard Assignment for Every Class: In addition to other

assignments, for every class come in with either a good question or a statement that you know

everything. A good question consists of a statement of a situation or problem

and a summary of what you do and do not understand about it.

Request your access code: http://vhmthphy.vhcc.edu/ > General Information and scroll down to Request