Power and Energy -Ai Vy

Energy is the ability of a system to do work. The more food we eat, the more energy we absorb, three pieces of candy have more energy than one piece. Power, in the other hand, is how quick or fast energy is being released over time. In the video, after Meena ate a bar of Snickers, she has a lot of energy and she has to dance crazily to burn off those energy. In term of power, after a short time, it is slowly being released. 
-Ai Vy

Newton's Third Law -Ai Vy

Newton's third law states that "Every action has an opposite and equal reaction". This means that there is always a pair of force acting on both interacting objects. In the video, as Karlee hits the ball, she uses a force upon the ball and makes it move. However, according to Newton's third law, the ball also reacts on Karlee racket's with the same amount of force. Thanks to the tennis racket vibration dampener, which role is to reduce or eliminate the vibration coming from the reaction of the ball so that we don't have much impact from that reaction. Another example from our world is when a person punches the wall. The stronger he punches, the more strength the ball will reaction on his knuckles and fist. As a result, it cause injuries.
-Ai Vy

146 × 222 - introduction-to-physics.com

Acceleration -Ai Vy

Acceleration is change in velocity over time, referring to when we speed up or move at a faster and faster rate. In the video, Karlee runs from the left to right, at first at a pretty fast pace, but slows down over time. In the other hand, Meena runs from the left to the right, slowly at first and after they high five, Meena speeds up. Meena shows how a runner accelerates. In addition, we can see a lot more examples in our real life. For example, when a car turns from a normal street to free way, it speeds up in a significant way. When the velocity of a car becomes faster, it demonstrates acceleration.
-Ai Vy

670 × 503 - bristol.k12.ct.us

Role of Friction in Our World -Ai Vy

Friction is the resistance when the two surfaces come in contact. Friction plays a significant role in our world. Friction appears in daily situations in both a good and bad way. We are able to walk, run or drive our cars thanks to friction. Vehicles don't stop without friction. However, friction cause the car's engine to work less efficiently, and that's why oil is there to reduce friction between parts of an engine. In the video, friction is shown by the ball being rolled on the tennis court. The ball rolls for a while until it is stopped by friction, or in other words, friction slows it down and by that we don’t have to go too far to get the ball back.
 -Ai Vy

729 × 313 - www03.shoshana.com

Force Diagrams: Thrust and Drag - Frisbee -Karlee

Thrust is what propels and pushes an object forward. An example of thrust is an engine, it pushes an object forward. Drag is the opposite, pushing the object in the opposite direction of motion. Drag could be thought of friction. For example, when you are in a car and you stick your head out of the window you'll feel the drag that the care is creating. The two forces work against each other, but they overcome each other which changes the motion of the object. For example, in our video we featured a Frisbee, when throw into the air, there is thrust that pushes to Frisbee forward, but there is also drag that pushes the Frisbee in the opposite direction, making it slow down and eventually stop. Thrust and drag are essential to how things move, working in opposite ways, they help each determine an object’s motion.
-Karlee

Newton's Second Law - Hitting Tennis Balls Against the Fence -Karlee

Newton’s second law is based on the equation f=ma, where f is the force, m is the mass, and a is the acceleration. This means that force is equal to the product of mass and acceleration. Since changing the mass isn’t possible, changing the acceleration is the key force. The smaller the mass, the more it is allowed to accelerate quickly, and the larger the mass the smaller the acceleration. For example, if you have a motorcycle racing a plane, the motorcycle will accelerate at a faster rate than the plane, giving a big head start, however, once it has been a while the plane will have sped up and have more velocity than the motorcycle because of the build up to its terminal velocity. When we were hitting the tennis ball against the fence, using the racket to do so, made it speed up. The tennis ball’s mass didn’t change throughout the energy transfers. Since the ball had so much acceleration, it hit the fence and sprung back. Meaning that force is measured by both mass and acceleration, as shown with the tennis ball.
 -Karlee

Pressure = Force/ Area - Wind Turbine Blades -Karlee

Pressure = Force/ Area. If the force remains the same, the area will determine the pressure. The smaller the area, the more pressure. For example, the reason why laying on a bed of nails is safer than laying on just one. Since the area of the needles has been spread out evenly the pressure would also be spread out evenly too. If there was only one needle, then all the pressure of your body will be in that one point. This is pretty much the reason why bullets are really small. This holds true for wind turbine blades. The big blades didn’t turn as fast because the the pressure of the air blowing on the blades wasn’t as much as the smaller blades. Most of the time that means that the wind turbine with smaller blades produces more energy than those with bigger blades, meaning that the bigger the area, the less the pressure.
-Karlee