Wednesday, January 27, 2010

Circular Motion and Gravitation

I learned about circular motion and gravitation. Circular motion is motion in a circle or radius, we learned how to find the frequency, velocity,centripetal acceleration and force of an object moving in a circle. Centripetal means directed towards the center of the circle.Objects moving in uniform circular motion will have a constant speed not a constant velocity, the magnitude of the velocity of a body on a uniform circular motion is constant and its direction is always changing.Next was universal gravitation, which is when the gravitational force varies inversely with the square of the distance between two objects. The law of Gravitation states that every object attracts each other. Last there is Gravitational Acceleration which is when the weight on the object on the Earths surface is equal to the gravitational force between that object and the Earth.

I found difficult when finding the Gravitational Acceleration and force is converting the km to m, and also the scientific notation messes me up a lot too. Finding the Circular motion has been a little difficult but I understand it.

My problem solving skills have gotten greater by thinking more outside the box when mixing the equations to find static friction or something. That had showed me that there is an answer its not just unsolvable. When I kept on thinking it kept on making more and more sense to me. I think I need to work on using scientific notations in problems.

Monday, January 11, 2010

Newtons Second Law

The acceleration a system experiences when acted upon by an unbalanced force. This shows the friction that an object experiences when moving. I learned about using my FBDs to calculate the sum of the forces, EFx and EFy, and putting them equal to ma or zero depending if the system is accelerating. I also learned about friction, called mu. This can be figured out from the equation Ff=mu*Fn. Mu is actually a naked number because it is newtons divided by newtons.

I have found finding the mu difficult because sometimes i will not remember the equation. Or finding things with not much information. Also what I found difficult was finding the tension in the string.

My problem solving skills are getting better from the other sections I am now understanding the concepts of the systems. Solving problems, doing classwork, and homework has gotten easier. But I have been a little lazy in my work, but i have started to pick it up on homework and classwork.