Newton’s 1st Law -Meena

Newtons 1st Law is that all objects at rest will stay at rest unless an external force acts upon it.  All objects will continue their original state of uniform and they will always want to return to that state.  This law can commonly be known as inertia. Inertia and the first law is seen everywhere, a demonstration I saw in class was a video of a rock at rest a person came a long and rolled it down a hill making the at rest pebble to become a pebble in motion soon the external force of friction caused the pebble to return to its natural state, at rest.  This video relates to our high five video because a phone lyed on the ground at rest until I came along using my external strength to pick the phone up.  The phone became “apart” of me so as I moved the phone did so we were both in motion.  In the end my video shows clear evidence of Newton’s 1st law because the phone was not going to move unless I, the external force, lifted it up into motion.

*With no outside force this object will never move. With no outside forces this object will never stop.

-Meena

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

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