P h y s i c s
Mapping Project
- I think our map is a pretty close representation to the park. The map takes on the park shape and the objects like the house are fairly close to the actual point. I do think the placement was a little off though. I know that in some places we messed up on distances, and we were crunched for time, so we ended up having to wing it. When we were taking distances with the strides, sometimes Steve walked the distance, and sometimes I did. That might not seem bad at first, but when we were to calculate the distances and draw it on the map, we found out that we didn’t mark who walked which distance.
- To measure the distance in the park we paced out the straight sections. We were careful to pace as equally as possible to eliminate variation in each of our steps. When we finished recording the paces for all the straight sections we took a rope to measure the curved sections. The curved sections were measured by taking a rope, and guess and checking the inside middle of the curve so the rope stayed an equal length to the outside of the curve. We calculated the distances from steps to feet by taking 6 steps and finding an average length. This method is a good method to roughly measure the park distances, but bringing a very large tame measure would have been more accurate for the straight sections. The rope idea is a good idea as long at there aren't obstructions like trees in the way.
- We dealt with the magnetic inclination by subtracting 10 degrees from magnetic north to get true north. We first measured the bearings with the compasses, and then we later on paper subtracted 10 degrees.
4. Georeferencing is defining where an objects position is. We accomplished this by pacing a straight distance from a marked point to the object. We also used a GPS to get latitude and longitude to put on our maps. We then calculated steps into feet.
The rocket project.
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The physics behind the rocket
Rocket Project Reflection
Dylan Kroes We started designing our rocket around the V2 german rocket. The rocket was designed to be very aerodynamic with a long pointy nose cone. It was designed to be very long because of stability issues. The fins were based off a missiles fins because of the super fast acceleration nature of water rockets. The reason why we did not want the rocket to be skinny and then have a transition is because we wanted the rocket to only have one point of major friction. The rocket was designed to be as light weight as possible utilizing a fiberglass nose cone as to maintain the lighter weight. Our test launches went well, but as soon as the launch pressure was reduced to 80psi our rocket was too heavy to push through the air effectively. When the pressure was increased to 130psi the rocket went very high. The rocket penetrated the air more effectively while going faster. I would change the rocket parachute deployment system if I were to do it over. The nose cone was half off when the rocket reached its apogee so the rocket was less efficient. I would have made the rocket lighter, but in the same shape in order to get the rocket as high as possible. I would have designed the parachute deployment with a windup toy, a spring, and a string. The windup toy would be connected to the main fuse with a string to the nose cone. The nose cone would have a spring compressed with the tension of the windup toy and string. The sting would then unwind with the windup to release the nose cone and have it spring off. Some ideas that I would have taken from other rockets are a looser nose cone so the parachute came out on the apogee. I would have also taken Josh Davoust’s idea of taping the bottles together instead of using the heavy epoxy.That Is all I would have taken from the other rockets. |
Our rockets went up because of lots of different variables. If the rocket was designed right and flew straight, the aerodynamics and all the weight were even more complicated. There were three phases of the rocket flight; charging, acceleration, and coasting. Newtons third law, For every action there is an equal and opposite reaction, is used to explain why the rocket goes up. There is equal force when the rocket is armed at the launch pad inside the bottle. When the bottle is released, the water and CO2 is trying to find a place to go, It finds the easiest path and goes there. The path is the nozzle aimed down. The pressure is at 80psi and there are 80 lbs. going into the rocket launch. If the rocket weight is less then the propellent force, the rocket goes up. The fins are what keep the rocket straight in the air. Newtons third law also helps explain the physics of the fins. The fins are equal in the air, so the rocket keeps straight. The air resistance is what also keeps the rocket straight. The rocket would start turning if there was heavy air resistance on one side. The rocket uses the first and second laws when getting launched of the launch pad. The rocket has so many variables such as friction and momentum. Momentum is the mass and velocity after the propulsion phase and it is how long the rocket coasted. The second law; Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object) is used when charging the rocket to the launch. the amount of psi correlates to how hight and how much force the rocket exerts. |