- Make 3 jumps each with 2, 3, 4, and 5 rubber bands from a height of 1
meter. You may wish to use a pen, and hold it perpendicular to the top of
the stick, so that you drop the egg sufficiently far away from the meter
stick.
Record how far the egg travels from the top of the
meter stick to the point closest to the ground (12 data points).
Be very careful with your egg - protect it from hitting anything
and make sure that it doesn't swing back and hit the meter stick.
Accuracy is important, so
the same person should drop the
egg each time, and the same person should be watching the meter
stick each trial.
Number of rubber bands

Distance dropped in centimeters

2

2

2

3

3

3

4

4

4

5

5

5

Enter your data into excel, create a scatterplot chart and add a trendline and r*Excel and Data Analysis*^{2}value to it (see the other lab for directions if you've forgotten). Write down your results here

- REGRESSION LINE:
R
^{2}VALUE:

**For Discussion (Leave Until Later)**Even with the variability in rubber bands and possible measurement inconsistencies, using the r^{2}value, your number of rubber bands should be a very strong predictor of the distance traveled. Explain how common sense alone applied to the stretch ability and similarity of the rubber bands and the problem setup can be used to**explain why the relationship is linear**(ie why is it a constant slope when change in y/change x = change in distance dropped / change in rubber bands?) and why this predictor is so strong.

- EXACTLY what prediction of the distance traveled does the
regression line give for
10 rubber bands? SHOW WORK!

- EXACTLY what prediction of the number of rubber bands required
for 2.0 meters does the equation of the regression line give?
SHOW WORK!

**For Discussion (Leave Until Later)**Why won't everyone in the class have the same answer for this question? Relate your response to the placement of the paperclip, the weight of the egg, the egg dropper, etc.

- Using the predicted number of rubber bands, the R
^{2}value, and anything else you want to factor into your decision, decide how many rubber bands you will use for the 2.0 meter bungee jump. You may be creative and fold a rubber band in half. How many will you use?

**The Contest - Directions** **Build, but DO NOT TEST the bungee machine,**adding the rubber bands until you reach the number of rubber bands that you previously decided on, and**then leave it alone in a safe place until we come back together as a class. I.e. DO NOT measure the length of the assembled bungee cord in any way, and DO NOT change or test your apparatus at all.**- While waiting for the contest, go back and work on the "For Discussion" or other homework for tomorrow or Thursday (see the main web page).
- When it is your group's turn, bring your bungee machine
up to the front of the room.
Perform the jump. The team that comes closest to the ground
**without any egg damage**wins.