1. Given the challenge and the performance of your car on Test Drive #1, what change(s) did you make for Test Drive #2? We changed the wheels and we changed how the car is shaped and how we made is go. We combined 2 wheels.
2. What differences did you predict these changes would make in your cars performance? What makes you think this? I thought it would go farther because it was lighter and I thought the lighter it was the farther it goes.
3. Think about the variables such as the size of the spool, weight of the washer or tension of the rubber band. How might these affect how far or how fast your car will go? How big the washer was because the bigger it was the heaver it is.
4. What worked better the second time? It went farther and it was faster
5. What still is not quite working? The racer only went 22 inches because it was just a wheel with a rubber band inside.
6. What questions do I have? How can we make it go fast like a normal car with only 2 wheels.
7. What might I try next? I would make it like a real car with 4 wheels if I can.
8. Explain the energy transfer that is taking place in the racer. The elastic energy from the rubber band powers the car.

1. What do you like about your initial design? I like that it’s different and how the wheels look like a real cars wheels.

2. What has been challenging about the initial design? We did it in 5 minutes because our other one didn’t work so we had to figure out quickly how to power it with rubber bands.

3. How well did your racer perform in the first race? Did it go far? Fast? It only moved a few inches because it didn’t work.

4. How will you modify your design for the second race? What variables do you feel will affect how far and fast the racer goes? Why? I would make it more sturdy because it broke and I would change how we launch it because it broke when we launched it.

5. What have been your strengths and challenges during the design process? My partner and I agreed on a design and we work well together. Some challenges have been making sure it’s rubber band powered because we had a perfect design but we couldn’t rubber band power it.

6. What questions do you have? How can we make it move with a rubber band but make the wheels move? How can we make a racer with only 2 wheels.

Did the Sea Lamprey cause a decline in the Trout population?

The trout population declined because of the sea lamprey. According to the article fisherman’s journal, it’s hard to catch big fish and trout because the sea lamprey are eating them. Also According to the trout and sea lamprey graphs from 1945 to 1960 the sea lamprey population increased but from from 1950 to 1970 the trout population declined. According to the reading 6.1 The passages are allowing the sea lamprey to come to the Great Lakes. This is important because the sea lamprey is the top predator of the Great Lake food web which means that the sea lamprey doesn’t have any predators so nothing eats it,  so they keep reproducing and making more sea lamprey. This means that, there are more lamprey to eat the trout which declines there population.

When I was dissecting the sea lamprey and was looking at the mouth I could see why it’s such a threat to the trout. Even though it’s teeth are small they are sharp and that can bite through literally anything.  According to the seagrant.umn.edu, The lamprey’s Way of eating is to attach to fish with their mouth and teeth, and then use its tongue to go through a fish’s scales and skin so the lamprey can suck ups its blood and body fluids like a suction cup.  Also a single sea lamprey will destroy up to 40 lbs of fish during its adult lifetime. This means, that the trout population declines because the sea lamprey eat the trout, because the lamprey lays so many eggs there’s a lot of fish to eat the trout an make the trout population decline.

According to bioweb.uwlax.edu the sea lamprey lays about 30,000 eggs which is a lot. So from how many eggs it lays you can see why it’s such a threat to trout, other fish and fisherman, because they just keep reproducing and at the end there’s hundreds of thousands of sea lamprey.  The life cycle of the sea lamprey is that first the animal gets born with hundreds of thousands other siblings then a few months later has about 60,000 kids ( some don’t make it though so it brings it down to 40,000 or 30,000 eggs the hatch) next dies and this happens with almost all of the lamprey ( some are male and only the female can reproduce baby sea lamprey). This means, that there are more sea lamprey to eat the the trout, other fish and are a threat to the fisherman because they aren’t catching enof trout and other fish for people to eat because the lamprey are sucking on to the fish and eating them.

Sites

http://www.seagrant.umn.edu/ais/sealamprey_battle

sea lamprey graphs

article fisherman’s journal

http://bioweb.uwlax.edu/bio203/f2013/guise_aman/reproduction.htm

• What is the value of dissecting? I think the value of dissecting is to really make sure your getting into detail and look at all the different parts of the fish. Also dissecting makes you think about different things for example looking at the mouth of the sea lamprey  I released how much it is a predator because of its sharp and strong teeth.

• How did the dissection help you understand what is happening between the sea lamprey and the trout? I helped me because it  showed me about the mouth of the sea lamprey is a predator to the trout because of its teeth.
• How did you feel about dissection? If you enjoyed the process, why did you enjoy it? If you did not enjoy it, what was difficult about it? I didn’t enjoy it because I’m not the type of girl who likes science and dissecting I like fashion so I grossed me out because of the insides of the fish and just seeing the inside. 

What do you think invasive species means?  I think it means a ecosystem maybe has changed because of the food chain and is going to keep changing because of different animals.

What does it mean to invade something? I means get into there stuff/invade there stuff.

Can animals invade? Yes because animals invade to get food and to find there habitat.

What about plants? Yes because plants invade to grow and when they get bigger they go into the other plants space.

How might invasive species affect other organisms in their environment? It maybe will affect the food chain because if animals keep coming in and out of the food chain animals will start to die because other animals keep dying.

Key Terms and Concepts:

• Potential energy (stored energy)
• Kinetic energy (energy of motion)
• Conservation of energy (basic law of physics)
• Gravity
• Velocity
• Friction
• Slope (rise/run)

Visuals of my project:

PICTURES COMING SOON

Summary of my project:

We started with 2 tubes and cut one of them then got 1 more tube and cut it. We struggled to get the roller coaster to work.

HL: Documenting

OC and SM: Presenting/Testing

First, OC and SM got a new balloon and a new straw

Then, SM put the straw in the balloon and tied it of with a rubber band

After that, OC blew up the balloon.

The first time OC blew up a balloon, it didn’t work because there was a hole in the straw

The second time though, it worked when OC blew up the balloon because SM got a new straw

Then OC and SM tested/presented the boat.

When OC and SM presented the boat, it moved!!

Then we took the balloon out of the water and SM and OC took the balloon and the straw out of the boat and threw it out.

Materials needed and where we will get them

• Basin to hold water – Gev. Clyde has ours
• Empty milk carton, pint size – Gev. Clyde will get us some
• Straws – Gev. Clyde has them
• Large 12 inch Balloons – Gev. Clyde had some
• Scissors – From our lockers
• Small Rubber band – Gev. Clyde had some
• Tape – From our lockers
• Warm water – Bathroom or Kitchen
• Dish Soap – Gev. Clyde has them
• Paper Towels – Gev. Clyde has them
• Paper Cups – Gev. Clyde has them

I accomplished  making the list for our materials for the challenge.

We accomplished every thing we needed to do.

My goal is to do the accomplish the challenge.