Sir Isaac

This past weekend was a football-filled weekend. Whether it was playing football on Friday, or watching it on Saturday and Sunday, there was a lot of football. While watching football today i became so excited that i knocked a water bottle down. As i watched the bottle fall, i noticed two principles of physics in action. The first was what we just learned about acceleration and velocity. The second principle was Newton's second law of motion. For acceleration and velocity, the bottle had an initial velocity of 0 m/s until i knocked it down where it fell at -9.8 m/s due to gravity. The bottle then hit the ground where it stopped. Newton's second law of motion states that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an outside force. In this case, the bottle went through Newton's second law twice. The first time the bottle was at rest on the table. My hand acted as the outside forced which caused the bottle to go in motion. The ground was the second outside force which caused the bottle to go from motion to rest. If the ground had not been there then the bottle would have kept on falling until it hit some other outside force.

velocity

Today as i was standing outside my balcony i noticed cars driving down the street in opposite directions. Everytime a car is in motion it is in some form of acceleration and velocity. I noticed that they were either positively or negatively accelerating, or travelling at a constant velocity with no acceleration. At the time of the picture the van is moving at a constant velocity of around 30 miles per hour and continued at this rate for about 3 seconds. Before the picture was taken the van was accelerating to this velocity of 30 miles per hour. At the end of the road there is a slowdown zone where the van decelerates with a negative acceleration until it comes to a complete stop and it's velocity becomes zero. The van then positively accelerates increasing it's velocity until it reaches the speed limit.