Sunday, October 23, 2011

Quarter 2, Blogpost #2

This week we've been studying types of forces and learning to creating free body diagrams. A force is simply a push or a pull. A force is determined by both magnitude and direction, making it a vector. Different types of vectors include net forces, contact forces, frictional forces, and balanced forces. Net forces are forces that are unbalanced. For example, if you stand on one leg and can't remain still and are leaning to one side, there is a net force acting on you. Contact forces are forces that take place when at least two objects are touching. Frictional forces are forces that oppose motion or impending motion. Lastly, balanced forces have no acceleration but could be moving at a constant velocity. In this picture, the tennis ball on the graph has two forces acting on it. The first force is the force of gravity. Gravity creates the downwards pull, keeping the ball on the ground. The second force acting on the ball is called a "normal force" A normal force is a downward force of gravity being opposed by an upward force. The normal force acts upward on the force of gravity, causing the pull of gravity and the push from the ground upward on the ball to be balanced, meaning no acceleration.

Monday, October 17, 2011

Quarter 2, Blogpost #1

Last Friday, our class had our ring social on Konia field. After everyone received their rings, we had an ultimate dodgeball tournament (: Here is a picture of our team, "TAXi SONO QUi" meaning, "The Cabs are Here!" (Haha its from Jersey Shore). So in this picture, the boys wanted to do a huddle and do that thing where you rock back and forth. Us girls were all in, then they started moving too fast so we started resisting, and the whole rocking idea didn't really work out too well. We girls presented an example of "Newton's First Law of Motion" stating that objects in motion will tend to stay in motion unless acted upon by an outside, unbalanced force. The swaying of our huddle would have stayed in motion but it was acted upon by an opposing, unbalanced force, the three girls. We three stopped swaying, causing a resisting force that kept the boys who were in motion to stop as well.

Sunday, October 2, 2011

Blog Post #7

My entire family loves to watch and play football. If you know me well, this might seem a little weird being that the majority of my family is girls and that I don't have any boy relatives who live in Hawai'i that play football. But my dad is a huge football fan so we watch professional, collegiate, and high school football all the time.
This picture is a visual of what my dad uses his finger to draw on the football when he plays with me and my sisters outside in the yard. He'll run his fingers along the seems of the ball and say, "okay, so run ten steps till you hit your sister, cut left and run 10 steps towards uncle's truck, then cut right and run five steps".
This route is made up of vectors. Vectors explain "which way" and "how much". So in "physics terms", my dad is telling us to travel 10 steps North, 10 steps west, then 5 steps east in relation to our position from the defender (purple x).