Newton's 2nd law resource

This video clearly describes Newton's second law of motion. Acceleration is directly proportional to force and acceleration is inversely proportional to mass. In this video it is made clear that the ball with more mass went slower and traveled a lesser distance then the ball with the lesser amount of mass when an equal force was applied.

Unit 1 Reflection

In this unit I learned all about Newton’s first law of inertia, which states that an object in motion will stay in motion or an object at rest will stay at rest unless a force is exerted upon it. I learned about net force, which is the total amount of forces acting on an object, equilibrium, which is when the net force on an object is zero. And lastly I learned about velocity, which is a certain speed of an object going in a certain direction, speed, which is how fast an object is going, and acceleration, which is how fast an object is speeding up.

What I have felt was difficult about what we have studied pertains to speed, velocity, and acceleration. It is very simple to get these three concepts mixed up. For example, a car can be traveling at a constant speed with constant acceleration. Or a car can be accelerating in one direction with constant acceleration but not be in constant velocity. Constant velocity requires constant speed, but if something is traveling at a constant speed it may or may not be traveling with a constant velocity.

I overcame these difficulties by completing my homework questions. I had a large amount of homework questions and doing these velocity, speed, and acceleration related questions were very helpful. I have found that I learn very well through repetition so doing the amount of problems that I did and going over them in class and talking about it during class helped me a lot.

Personally, I enjoyed solving the problems that we had for homework. I quickly learned that there were a lot of trick questions. For example, if a car is moving at a constant velocity of 20 km/h for 2 hours what is the cars acceleration? Well there is no acceleration because you are moving at a constant velocity. I got a lot better at reading the question and thinking about what the question is asking for rather then just plugging numbers into equations or restating definitions. Everything required and explanation of reason so that required me to actually think about what I was saying.

My goals for the next unit are to get better quiz grades by showing more steps in my math. A lot of my points got taken off for not showing complete steps in my mathematical equations. The lost points could have been easily avoided if I had shown all of my steps completely.

There are so many connections that physics makes in everyday life. Physics is significant in everything from pushing a box to the importance of headrests and seatbelts. Quite frankly, when I learned how relevant physics was to my life I was shocked. I didn’t know much about physics before I started the class and I am surprised at how much it pertains to my life.

The link to the podcast that I made with Becca and Isabelle on the concept of Inertia is below

http://www.youtube.com/watch?v=0n54MysJW88&feature=youtu.be 

Picture!

In this photo, Megan is hitting a book out from under a water bottle. The water bottle falls straight down rather then flying in the direction that Megan hit the book. This is so because of Newton's first law of Inertia. This law states that an object in moition will stay in motion or an object at rest will stay at rest unless a force is exerted upon it. The water bottle is at rest and wants to stay at rest, so when the book below it is hit, the water bottle stays put until the force of gravity pulls it down.

Trip Problem!

My original answer to the trip problem was 80 km/h. I didn't really use any formula for this answer, i just thought that all of the numbers together looked right. I never took into account the time. With the time as well as the speed, I realized that the car has already been traveling for one hour which would mean that the car would need to go faster then the speed of light in order to meet the average. In order to solve this problem you need to take into account the formula velocity = distance/time. Since I never took into account the time I got this problem wrong, but after discussing this in class the correct answer became clear to me and made perfect sense. 

The next time that I am asked a question similar to this, I will be sure to think about all of the aspects of the question, specifically time. 

Acceleration and Velocity!

http://www.youtube.com/watch?v=LFNWeqXAD-M

This video shows a roller coaster with a very high acceleration. This roller coaster goes from 0 km/h to 100 km/h in 2.4 seconds! This is an example of extremely fast acceleration. This can also be an example of velocity since the roller coaster has no change of direction that we can see. However when this roller coaster does change direction, which it most likely will, the acceleration will change and it will not be in a state of velocity because velocity needs to be going in a specific direction.