Tides resource

This video provides a very clear and engaging explanation of tides and how the moon and the sun have to do with it. The creator of this video made a diagram of where the moon has to be when there is a high tide and low tide. The side closest to the moon will experience high tide because of the gravitational pull and the opposite side will experience the high tide as well because the earth is pulling on the moon as well as the moon is pulling on the earth. I definitely believe that this video helped me to see how the tides are effected by the moon. When the moon is full then the tides will be higher than normal and when it is a half moon the tides are lower than normal.

Unit 2 Reflection

Newton's Second Law:

Newton's Second law states that acceleration is directly proportional to force and inversely proportional to mass, or a=F/m. Whenever mass increases, the acceleration. When looking at mass vs. weight, weight=(mass)(gravity), or w=mg. and example equation of this is:

Skydiving:

Skydiving is an example of Newton's second law in action. Here is a diagram of what happens when you leave the plane:

In the last part of the picture, the skydiver is in terminal velocity which means they are going as fast as they possibly can but are no longer accelerating. After they reach terminal velocity they parachute goes up. Once the parachute comes out, the surface area increases as well as the net force. The velocity continues in the downward direction, but now the acceleration is in the upward direction. This means that the skydiver is slowing down. Then the skydiver hits terminal velocity again where the F air is the same as before but the skydiver is moving slower, because of the parachute. They are no longer accelerating, but are moving in the downward direction.

Free Fall:

Free fall is when an object falls, with no air resistance. An example of this that was shown in class is a penny and a feather were placed in a tube with no air in it. When the tube was flipped over, the penny and the feather hit the ground at the same time. The only force acting on a object in free fall is the force of gravity. The equation used to determine the acceleration in free fall is : a=fnet/m. When you are searching for the distance, you use the equation: d=1/2dg^2. And when you want to know the velocity the equation v=gt is used. 

Projectile Motion (falling at an angle):

Projectile motion is when something is thrown or dropped. An example is when you drop two balls on the ground. If you were to shoot a ball off a table and drop a ball of the same table at the same time, they would hit the ground at the same time. The only thing that matters is the height. The balls hit the ground at the same time, because they left from the same height. When a person jumps off a cliff you must know the vertical and horizontal distances, speed, and time. When determining horizontal you use the equation: v=d/t. When determining the vertical you use: v=gt or d=1/2gt^2. When you hit the ground, you realize that you took a curved path, because you are moving both vertically and horizontally. 

Free Fall (falling straight down):

Free fall is when something falls and the only force acting on it is the force of gravity. The main thing to know about free fall is that there is NO air resistance. The weight of the object falling in free fall does not matter, because the only force acting is the force of gravity. If you were trying to figure out how high a cliff is and the only information is that an object falls off of it and falls for 9 seconds. You would use the equation d=1/2gt^2. 

Free fall (throwing things straight up):

When you throw an object straight up, neglecting air resistance, the object stops at the top of it's path and falls back down. The balls acceleration remains constant the whole time. The acceleration is 10 m/s^2, even when the ball's velocity is 0 m/s at the top of it's path. If the ball starts off at 40 m/s then the next second will be 30 m/s and the velocity will continue to go down until it is at the top of it's path and then it will accelerate back down at 10 m/s^2.