#09 Rotational Dynamics

Semester 1 – #09 Rotational Dynamics

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Bin Contents: 3 assorted rotators (your type may vary) A cylinder, a ring or hoop, and a sphere; a plumb bob; a metal rod; a 90-deg clamp; a table clamp.

Obtain a track and a stand – return when finished.


Obtain a 1-meter long ruler – return when finished. (Ignore the 2-meter rulers and the black & white rulers).


Obtain three consecutive sheets (keep them connected) and two carbon papers.


This and the next 4 images illustrate an updated version of Lab 07’s carbon paper sandwich; if you prefer to use that original Lab 07’s style, you are free to do so , it requires only 2 paper sheets and 1 carbon paper….

Note – you will need to create three separate sandwiches no matter which style of sandwich you chose; each rotator requires its own sandwich.


Place the first carbon paper with the dark side down as indicated.


Fold the other two sheets over the carbon paper.


Place the second carbon paper with the dark side down as indicated. 


Fold the remaining sheet over the carbon paper.


Draw a line across the sandwich’s top as shown (this line should be at the middle of the sheet).


Setup the incline plane using the stand, 90-deg clamp, rod, and track essentially the same way you did for Lab 04. Use your drawer’s inclinometer to set the angle to about 15-deg.


Attach the clamp to the edge of the table exactly as shown.


Another view of the clamp/track combination – note that the clamp is attached only to the table and simply abuts the track’s corner.


Yet another view of the clamp/track combination – note that the track extends out of the table’s edge; this is not a problem for the experiment.

Note – you are allowed to turn over the track to use it’s other side just in case your rotators either slip off the incline or crash into the clamp.


Hang the plumb bob from the edge of the track; even if the track extends out of the table.


Mark, with tape, where the plumb bob touches the floor.


The ranges for your rotators will not be more than 1-meter; set the meter’s zero to the spot where the plumb bob touched the floor (the tape at the left) and sit the carbon paper sandwich so that the line through it at your predicted range.

Note – expect the rotators to hit the same spot constantly, therefore, shift the carbon paper sandwich left and right after every trial.