Falling Through the Air Recourse

In this video, the guy is asking random people if they think the heavier ball and the lighter ball will hit the ground at the same time or not. Most people, incorrectly, say that they will hit the ground at the same time because the force of gravity on both of them is the same. This is wrong because the heavier ball will fall faster in order to reach terminal velocity, a state in which the resistance and the weight of the ball are equal. This is because when air resistance is being factored in to something falling from the air, we know that acceleration is equal to the net force of the object minus the air resistance on the object divided by the weight of the object. Therefore, the heavier the object the faster it must fall in order to reach terminal velocity, while the lighter object reaches terminal velocity more quick, and is passed by the other object.

Physics when Punting a Soccer Ball

This is a picture of Michael kicking a ball straight up into the air. If we know that Michael kicks this ball with a velocity of 40 meters per second, we can figure out not only how long the ball is in the air, but how high it was at its highest point. Because the force of gravity is 10m/s, we know that the ball's velocity looses 10m/s each second. Therefore, to reach the top of it's path the ball must travel up in the air for 4 seconds. Then, since objects gain 10m/s each second when falling down, the ball will take 4 more seconds to return to Michaels foot. This concludes a total of 8 seconds. Then, using the distance formula (d=1/2gt(squared)) we can plug in 4 seconds, the point when it is the highest, to find out how high it went.
d=1/2gt(squared)
d=1/2(10)(8) squared
d=40 meters.

Free Fall: the Affects of Gravity

In this video Bill Nye is throwing different objects of different weights off of a parking deck and onto a target three stories below. The time each object took to hit the ground after leaving Nye's hands is the same, even though we didn't time it. You can tell this from watching the video, but also because we know that the force of gravity on objects is always 10 m/s squared, when you disregard air resistance. Because of this each object took the same amount of time to hit the ground.

Newton's Second Law Resource

In this video he is talking about the second law of motion and unlike the equation we use in class he uses the equation force equals mass multiplied by acceleration. He's using a red ball and a yellow ball and the red ball is heavier then the yellow ball. Therefore, they have a different mass. The force is the same and will be the same for both of the balls in the cannons with acceleration. You can physically see that the heavier ball was going far slower and lower than the yellow ball which was lighter. This proves that acceleration is inversely proportional to mass meaning the more mass the less acceleration and the less mass the more acceleration.