Question

1. Pick a coin to use based on your birth month and the list here:

Jan – March	$0.05
Apr – June	$0.10
July – Sept	$0.25
Sept – Dec	$1.00

2. Place the coin “heads up” (with the persons head facing up) flat on a horizontal surface made of glass (could be a mirror, tablet, smartphone screen, etc.). Keep one end fixed and elevate the other end slowly until the coin moves (watch carefully as the coin may move suddenly or very slowly).
3. Stop moving the surface.
4. Measure the inclination angle (the angle from your table to the surface you’ve used). Do this by measuring the height of the raised surface and the length of the surface to infer the angle by a well-known trigonometric identity.
5. Considering your measuring technique and device, estimate the uncertainty in the angle. You may assume that the percent uncertainty in the sine of the angle is equal to the percent uncertainty of the angle itself.
6. Repeat this measurement (including uncertainties) a total of 5 times
7. Tabulate your data (include absolute uncertainties):

Trial #	Length	Height	Angle
1
2
3
4
5

Answer 1