Shadoof

Seems like a much easier calculation to use energy. What is the distance he could travel going at his original speed?

Never really took the time to think about how glasses actually work. I see now that they just readjust the focal point of vision.

Never been water skiing before, now I know how it works if I ever try.

In my previous blog I talked about the world of high performance sailing, this involves racing around a course. But then there is the boats specifically designed to go as fast as possible in a straight line, the boat that currently holds this record does not look like your average boat, its only purpose is a single direction as fast as possible. Here is a diagram going into how it works. (Some is cut off, only image I could find that explained it and wasn't in french.) At the begging of the run this boat is very slow and just gets pushed sideways by the wind as it has no keel to keep it moving forward, but once moving it takes off reaching a record speed of 78.93 mph. (Video contains swearing sorry) And with speed and max efficiency there is always some error bound to happen.

The world of sailing includes many different sub types including cursing, local racing, national racing, and high performance racing. Today I am going to talking about the very interesting world of high performance racing. The most known race in sailing is most likely the Americas Cup, for this race they used boats called AC 72's (pictured below). Whats so surprising about these boats is the fact that they fly above the water using fins called hydrofoils. What makes this so surprising is the fin's ability to lift the entire weight of the boat, 6.5 tons, on the size of a surfboard. By having the ability to sail above the water the boats are able to reach much greater speeds than previously achievable. Most mono-hull boats are only able to go a few knots, but once boats are put on foils, the hull of the boat is able to come out of the water to vastly reduce drag through the water. This allows some hydro foiling boats the ability to reach speeds greater than 60 mph. Another factor that helps the boats reach these speeds is their sail design, the AC 72's have very unique sails in their size and design. What is so unique about their design is that they are solid wings as opposed to the normal canvas that many sailboats carry. The size of their sail is also very large compared to the length and the width of the boat. The boat is only 72.2 ft long while the main sail is 131 ft tall, the way this is possible is because the boat is so wide that it is more difficult for the boat to capsize. This foiling can also apply to some mono-hulls including the moth, and some newer experimental boats, With speed the risk of failure increases greatly as well... OR

I find it weird that rubber has a lower coefficient of friction with snow but I have faith in the reference table.

I am glad that we give up physics for interesting movies. If physics applied for all superhero movies, there would be just a bunch of dudes (and girls) that would be extremely boring.

As said in my about me post, I like sailing, and let me tell you something there is a lot of physics in the sport of sailing. To start with the basic, I am going to talk first about getting the boat in the water. Often people keep their boats on trailers and lift them into the water every time they are going for a sail. This is no simple task as the particular boat I sail weighs in the neighborhood of 3,100 lbs (1.55 US Tons). To help with this problem there are cranes provided that we can use to lift the boat into the water that have a max weight of 2 tons. The crane's arm is about 6m long, so with the torque equation = rF we can find the torque put on the crane. =(6m)(13789N) = 82734mN, for context if you hold a liter of water (1kg) at arms length (.5m) thats only about 4.9mN of torque on your arm. The crane does have a max weight that can be put on it, so the max torque that can be applied to the crane would be 106752mN. There are countless other things that could affect the lifting strength of the crane including the chain that leads to the hook. The max strength that this chain should hold would be about 17792N. If the equipment is not in good condition then failure can happen and you are left with a boat that is smashed on the concrete and possible personal injury (speaking with experience). Thanks to modern technology and materials this feat of physics can be accomplished for a nice sail.

I wish I lived in a video game, my 10 lb backpack would feel like a feather.

On Friday September 16th our class was assigned the task to shoot a book with a ball. Some may say a very simple task, yet we failed anyway. Some problems that could have caused this failure was the lack of communication between everybody working alone, and also the lack of similar measurements. To redeem ourselves we were given the opportunity to redo the lab as a blog to get full credit, instead of a big fat 0. The ball was shot in the x direction at a rate of 4.64 m/s and in the y direction at a rate of .32 m/s. After calculating the initial velocity we could determine the time it would be in the air using the formula ∆y= vt + ½at². Plugging in the known values, (1.035 = .32t + ½(9.8)t²) for this I could use the quadratic equation to solve for t, getting a positive value of .43 seconds. Then using the time and the velocity in the x direction it is easy to determine how far it will go. Using ∆x = vt, we can plug in our time and velocity to get 1.99m.

Very fun game, interesting to think about all the work put in to make the physics engine so accurate.

That seems really interesting.

6 siblings! That's a lot.

Hello, I am a person that likes to sail, and do outdoor things like camping. My strengths include math and science. I hope to become an computer or electrical engineer. I am taking physics to help gain more college credits and to also learn if this is something I want to do. I would like to learn about how things interact with each other in this universe. I am excited to do labs and have fun. I am anxious about completing all of the work assigned in time and keeping my grade up.