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Recently I was watching Point of Interest, a TV show, and I was thinking about what kind of physics are behind firing a gun. I concluded that when the shooter shoots a gun, the force on the bullet is equal to that on the gun-shooter. This is due to Newton's third law of motion (for every action, there is an equal and opposite reaction). The force of the bullet is equal to the gun-shooter due to the law of conservation of momentum. A person with a gun have a combined mass M and the bullet has a mass m. When the gun is fired, the two systems move away from one another with new velocities V and v respectively. Also, the person with a gun moves in the opposite direction of the bullet. Therefore, the initial momentum is equal to the final momentum due to the law of conservation of momentum. Since the net force is equal to the change of momentum, the initial change of momentum of the person and gun is equal to the final bullet's momentum. Therefore, the person with a gun has a equal force and a opposite direction of the bullet.

That's really cool, I never realized how much work it takes to get some of the sail boats into the water. What kind of equipment mostly affects the max torque of the crane?

Tennis, a difficult sport to master, has many forces and transfers of energy acting upon it. As a two tennis players rally a ball between themselves, it seems unreal as the ball flies to incredible speed between them. This can be explained through Newton's law as the ball exerts a force to the racket, the racket exerts the same magnitude force but the opposite direction. Also the ball hitting the racket or the ground experiences a inelastic collision. This is why, it is hard for tennis players to hit a fast ball coming at them and to keep it in the court. During the contact of the ball to the racket, it loses energy and to keep the energy constant, the players has to exert energy to match the incoming ball's energy. Additionally, it seems impossible of the speed the ball flies and the accuracy some people have to keep the ball in court and high enough to above the net. This is can be explained of the the force of gravity on the ball as the ball flies through the air. The force of gravity helps the ball stay relatively low near the ground then in the air. Also for the reason the tennis ball stays relatively low to the ground, the tennis ball has a drag force resisting from the ball going straight in the air.

That's interesting, so what if a person without a case drops her/his phone at a certain angle and the screen cracks. Would the screen crack even if his a case? If not, how much do cases absorb the energy of the phone falling? If so, how would you make a case, so the screen wouldn't drop?

Swimming is a popular sport that involves a ton of physics. The physics of swimming involves an many forces between the water and the swimmer. It is these forces which propel a swimmer through the water. In order to swim, a swimmer must "push" against the water using a variety of techniques. There are four major techniques used for swimming. They are, Front Crawl (freestyle), Breaststroke, Backstroke, and Butterfly stroke. There are others, but ate used for recreational uses. By moving his or her arms through the water the swimmer creates a thrust force that propels the swimmer forward. This can relate to Newton's third law: every action as a reaction. The swimmer creates a force in the water and the water creates a equal opposite to propel the swimmer. However, there is a drag force created by the motion of the swimmer through the water. This force resists the motion of the swimmer through the water. This is why, it is very hard to swim long distances because there is a friction force resisting you from swimming.

That's really cool. So the reason why a trumpet is so high is because the instrument's length is small therefore a short wavelength. So due to your equation, a short wavelength equals a high frequency.

Since I was watching football (Go Bills!), I was thinking about the forces acting upon a football in the air. Newton's laws help dictate the pattern of all moving objects, including footballs. The path of a football's flight is not random, it is the result of the physical forces of inertia, air resistance, and gravity. Newtons first law of motion states that an object in motion will stay in motion unless acted upon by an outside force. A football travels in a parabolic path because of outside forces like air resistance to keep the ball from traveling in a straight line. Newton's second law states that the total change of an objects motion is equal to the sum of all forces acting on that object. As a football flies through the air the forces acting on it are constantly changing, except gravity. As the quarterback releases the ball, inertia is the greatest force acting on it. As the football reaches its highest point, inertia weakens due to air resistance. Then gravity takes over and pulls the ball back towards the earth.

On Friday, September 16, 2016, at 10:25 to 11:07, Dan Fullerton presented a lab. Unfortunately,the best 22 students of the high school, failed! Thankfully, Mr, Fullerton allowed us to redeem ourselves by writing what the right answer was and why we failed. This lab, Mr. Fullerton assigned to us was to shoot a projectile and predict where it would land. By doing this we had to use kinematics. We failed this lab for many reason. One main one was our lack of communication among our class. We didn't agree on measurements and we didn't communicate on answers. What we should of done was made four or five groups to figure out the answer and then at the end compare results. Another reasons we failed was that we forgot to set our direction. We didn't dictate what was positive or negative. In our Y-component, we assumed that everything was positive, but this was untrue. If we made the down direction positive, then the height and acceleration is positive, however the initial velocity is negative. Another reason why we failed, was that we had a variety of time of when the projectile was shot. When I redid this lab, the distance I found was 199.7 cm. I found this by calculating the initial velocity of the X component and Y-component. I made sure that I dictated the direction. Then I used Pythagorean Theorem to find the initial velocity of the projectile. Then, when Mr. Fullerton changed the angle and height of the projectile, I had to find the the X and Y velocity components. I used the initial velocity, multiplied it by cos (the degree) and sin (the degree). Then I found the time in the Y-component, which is the same for the X-component. Then I multiplied it by the new X velocity component to find my distance.

That is so cool. You just made baseball a little more interesting. I never thought a person could have create 1628 revolutions per minute spin of spin on a curve ball.

Curving a soccer ball, seems easy enough. Everyone is able to do it, on purpose or accidentally. All you have to do is kick a soccer ball. And yet, there is so much physics in how a person can curve a soccer ball. The reason a soccer ball curves is because the kicker kicks the ball at a certain angle and velocity causing the ball to spin. However, once the ball is in the air, it is really the air that is curving the ball. This seems impossible, but the air resistant will curve and bend the ball in a way. The Magnus effect is a lift force that causes the ball to curve through the air. As a spinning ball moves through the air, it spins a boundary layer of air that clings to its surface as it travels along. On one side of the ball the boundary layer of air collides with air passing by. The collision causes the air to decelerate, creating a high-pressure area. On the opposing side, the boundary layer is moving in the same direction as the air passing by, so there is no collision and the air collectively moves faster. This sets up a low-pressure area. The pressure differential, high on one side and low on the other, creates a lift force (the Magnus force) that causes the ball to move in the direction of the pressure differential. The force can applied to any direction, for example, backspin, topspin, and side spin. Down below, I hope you enjoy the craziest curve shots!