Current Event 1 Quarter 3

Petra 7A

Science

Mrs. M.

http://www.cbc.ca/video/news/audioplayer.html?clipid=2329176123

http://www.cbc.ca/quirks/episode/2013/01/26/january-26-2013/#3

3/14/2013

In Newfoundland, Canada, something odd was found. A coyote roaming the countryside was reported to have a completely white pelt! On top of that, it was found that the coyote was not albino. It was found that this coyote had a gene mutation that is also found in golden retrievers and other red or gold dogs. The mutation shuts off the production of one pigment, namely the dark colour, and that makes the production of another pigment, namely gold or red. That is the case with golden retrievers. With these white coyotes, it seems that the other pigments did not get produced, so what was left was a white coyote. It turns out that this new ‘species’ appeared some time after a coyote and a golden retriever disappeared together during mating season. Scientists believe this is the reason of the white coyote.

Lab Report - Weights and Waves

Guiding Question
Does the size and weight of an object determine the size of the waves it makes?

Hypothesis
I think that the size/weight of an object does affect the amplitude of the waves produced.

Variables

• Controlled: Water, pan
• Manipulated: Size and weight of objects dropped in
• Response: Amplitude of waves. 

Materials

Water

Pan 

1 pound weight

2 pound weight

cork

small metal ball

Procedure

1. Fill pan with water.
2. First, drop the 1 pound weight in. Record the height of the waves (roughly) in the data table. repeat the process two times. Remove the weight.
3. Next, drop the 2 pound weight in, and so on. Record all of your observations in the data table. 

DATA TABLE

Item	Trial #1	Trial #2	Trial #3
1 pound
2 pound
Cork
Metal ball

Wave Lab Report

Data Analysis

When a wave hit another wave, they bumped into each other, yet kept going on their own ways, like nothing had happened. When a wave hit a barrier, the wave would crash into it and would not keep going, because there was something blocking its way, so it would just dispel. If there was a split in that barrier, though, the part of the wave that was heading toward that split would keep going, and the rest of the wave would hit the barrier that was obstructing their path. When a wave hit the other side of the pan, it would just bounce back.

Simulation

In the simulation, I found many things, but quite a few of them were already covered by the lab. One thing that was shown was that the more drops that were dropped, the more waves were created. Also, the bigger the drop, the bigger the waves it creates. The simulation is a great was to find out things about waves.

CONCLUSION

1. When water is dropped from a pipette into a pan of water, how do the waves behave? The waves roll outward, away from the point of impact.
3. How do waves interact with each other and with solid objects in their path? When waves hit each other, they bump into each other, yet then move on and keep moving in their path. When they hit solid objects in their path, they crash into the objects, and that stops their movement.
My hypothesis was somewhat correct, but only somewhat. I wrote that when waves meet, they crash into each other, but not that they move on with nothing changed. I also wrote that when they hit solid objects in their path, they crash into them and find their way around, but that was proven not necessarily true in the lab. The waves crash into the objects and their path is interrupted, so they do not roll anymore. When the waves hit the side of the pan, however, they bounce back.

Further Inquiry

I think there were some things that went wrong, perhaps the time when the waves went under the cork rather that carrying it along with them. I think that's what should have happened. Also, what was interesting was that some water was stuck in the cork after the previous experiment, so that when we put the cork in the pan, the water leaked out of the cork, and, as a result of being in the cork for so long, the water that leaked was yellow. I would really like to find out why, when the waves hit the clay, they did not just bounce back like they did when they hit the side of the pan.