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About skyblue22

  • Birthday 04/06/1995

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  1. Have you ever thought about the physics on a roller coaster? Well, its pretty simple. Once you are in the car of the roller coaster you build up potential energy as you go up the hill, which then is released as kinetic energy. Once you are going to the hill gravity takes over and all of the potential energy you built up is released into kinetic energy. Gravity applies a constant downward force on the cars. Since an object in motion tends to stay in motion, the coaster car will maintain a forward velocity even when it is moving up track. The potential energy and kinetic energy changes back and forth to one another.
  2. This is awesome! Nice blog entry!
  3. skyblue22

    Look Out Below!

    That sounds really scary!
  4. I would have never realized how much physics is in a toaster!
  5. Have you ever rock climbed before? Have you ever wondered what physics is involved? Well, there is so much physics involved. Before you start rock climbing they give you a special type of shoe that makes it easier for you to climb. Compared to your sneaker the climbing shoe has a higher coefficient of friction than the sneaker. The sneaker's rubber is stickier to help you grip the rock better. This same use can be seen with the chalk that you use on your hand during the climb. This can be shown as Ff= uFn. When you start to climb and you are held by the rope the downward force would be gravity, the rope exerts a force upward and the rock exerts a small force leftward. A belayer device counteracts the downward force of the climber by using friction to prevent the climber from falling. The force exerted can be shown by F=ma.
  6. Have you ever been kayaking before? Well, if you have doesn't kayak paddling seems like a confusing motion? Since water is a liquid when you push against it, it would seem like it would just move out of the way. But it does not, when you push against the water, you actually move forward not the water. Why is this? The reason you move forward is because of newtons 3rd law, which states that for every action(paddle) there is an equal and opposite reaction(movement). This means that for every paddle stroke you do, the pull of the stroke along the water is equal to the movement that you experience. Newton's 2nd law states that the force exerted on an object equals the mass of the object multiplied by it's resultant acceleration, which can be shown by the equation f=ma. For example, if the kayaker has a total mass of 50kg and they exert a force of 150N then you would divide 150N by 50kg in order to find the acceleration, 3m/s^2. Can you guess how many canoes and kayaks there are in the image above? Well, the kayak/canoe raft consists of 1,902 boats, which sets the Guinness Book World record for the largest raft of canoes and kayaks!
  7. Kite flying can be for all ages, young or old. They come in all different shapes, colors and sizes. Each kite following the basic kite design. The physics of flying a kite is very similar to lifting an airplane off the runway. To get a kite airborne its necessary to run while holding the kite behind you. One the kite reaches a high enough altitude and the wind becomes strong enough, the kite will fly aloft. Forces are applied to the kite to keep it in the air. The wind blows in the direction of the kite and underneath it to lift it up into the sky. If the wind were to blow the tail from the side, the kite would rotate itself to line up with the wind. In order to keep the kite balanced a tail must be added to the end of the kite at different locations to add stability. As shown in the diagram above a lift force is created perpendicular to the kite while a drag force is created parallel to the kite. Gravity is also present shown by arrow g.
  8. I never thought of this! Great idea!
  9. I have always wondered why this happens! Awesome video!
  10. A horse has multiple gaits. A walk, a four beat gait, a trot, a two beat gait and a canter, a three beat gait. The most common gait to jump from is the canter because it allows the rider to have a more consistent velocity to jump. In order to balance the rider goes into a position, which is known as a 2-point during the flight. There are four phases of a jump, approach, takeoff, flight and land. In the first phase of the jump (approach) the horse only has kinetic energy which can be expressed by . During the takeoff the horse uses Newton's Second Law of motion to push itself off the ground. After takeoff the horse only has potential energy. This can be shown by PE=mgh. At maximum height the potential energy is at its maximum while the kinetic energy is zero, which means that the velocity is zero. Thus, the only force acting on the horse is gravity, a=g=9.81 m/s2. Last, the horse lands and has kinetic energy. The horse returns to the original velocity. Since this happened the forces during the jump can be added together, where it should equal zero. The horse's energy goes from kinetic to potential to kinetic. This is known as the Law of Conservation, which can be shown by the formula .
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