What's inside?

Prelab:

1. Comparing Eq (2.10)

with Eq (2.15)

we get

2. The result in Q1 can be rewritten as,

if we choose y=h and x=v², then

Lab:

1. For the data of the three balls, please use caliper correctly and measure the diameter of the balls and report the values.

2. The Vernier caliper in this lab has a precision of 1/20mm (0.05mm). After measuring the diameter (see instruction in Wikipedia), you can put the value into Logger Pro. The precision of the input data in Logger Pro can be adjusted (double clicking the data and edit the 2nd column).

3. When calculating v² from v, you should keep the number of significant digits (see my comments and suggestions on you report at Blackboard, just click your report and click "GradeMark", then you can see my comments).

4. Uncertainty source: if your C value is negative, that could be caused by the fact that the center of the ball is not aligned with the sensor of the photogate, making the velocity measured to be larger than the actual velocity (v=d/t. You have inputted d into Logger Pro, but the time that the ball blocking the sensor will decrease, thus the velocity measured is larger), making your C value smaller and even negative.