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2014 HoCoSTEMFestival Activity
Recommendations, Presentations, and CV
Episode 9 Surface Projectile
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PROCEDURES (followed by ScienceBuddies):
1.
Prepare your satellite mounting device (a clothes hanger) for your volunteer to hold for you. Hang each of your satellites from a clothes hanger at different lengths using the attached strings. One satellite should be on a short string (about 10 cm), the next on a medium sized string (about 50 centimeters), and the last on a long string (about 100 cm or 1 meter). If you are using more than three satellites, just change your measurements accordingly.
2.
Next, you will need to set up your crater impact simulation. This experiment is very dusty and messy, so you will need to set up your simulation outdoors. Also, you will need to bring your volunteer to help you hold your satellites during the "meteor" impact. Your back yard would be a good place to set up your simulation site.
3.
Place a tray or shallow box on the ground at your test site.
4.
Fill the shallow tray or box with ash from your fireplace or grill. If you do not have any, you can substitute any light, dusty powder in place of the ash like: chalk, talcum powder, etc. Allow all of the ash to settle and do not disturb the ash until you are ready for your experiment.
5.
Smear a layer of petroleum jelly (Vaseline) on each circle of your satellite. The jelly will collect particles by sticking to them. You should have four jelly-smeared collection circles on each satellite. NOTE: It is very important to protect your satellites after this step, so that you do not accidentally contaminate the jelly-smeared circles with debris. Try and keep them clean until you do the simulation!
6.
Have your volunteer put on a face mask and hold the satellite hanger above, but not touching, the surface of the ash. Explain to your volunteer what you will do in the next step (so they won't freak out) and tell them to hold very still.
7.
After a countdown, throw a "meteor" (a hard object such as a baseball) into the pile of ash, causing a "crater impact" and sending up a cloud of "stardust" around the impact crater.
8.
After the dust settles you can tell your volunteer to give you the satellite hanger, and be sure to thank them for doing such a great job.
9.
Using a digital camera, photograph each collection circle (4 total) for each satellite using the digital micro setting on your camera. Here is an example of the three photos I took for my experiment:
10.
Once you take your pictures, you can repeat the experiment and collect more data by wiping off the petroleum jelly COMPLETELY and starting again at step 10.
11.
Calculate the average number of particles for each satellite orbit distance by adding together all of your data (in this case, circles 1-4) and dividing by the number of data points (4). Write your answer in the final column of the data table.
In what ways does the average number of particles collected increase or decrease with orbit distance?
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