Today we have done an interesting experiment. Measuring the movement of the balls made out of different materials powered by human breath. We used a Styrofoam ball, a big marble, a small marble, a ping pong ball, a golf ball and a tennis ball. For blowing, we used a straw and we blew with our normal breath, with a middle strength breath, and with a hard breath. We taped a ruler on a desk so we can measure the length of every ball's movement. Here are the results: with a normal breath the shortest length was traveled by tennis ball; with a normal breath the longest length was traveled by ping pong ball; the tennis ball traveled the shortest distance when powered by middle breath; the ping pong ball traveled the longest powered by the middle strength breath; the hard strength breath moved the tennis ball for the shortest length and ping pong ball for the longest length; normal breath didn't even move tennis and golf ball. What we have learned is that movement of an object is always related to its mass and the amount of energy - force needed to create its movement.

KWL Forces and Motions

In science class we have began a new unit which is called forces and motions. I don't know much about forces and motions, in second grade I have learned about gravity which is a force on planet Earth how it pulls everything to the earths surface. but  since then and on haven't learned much about gravity so I'm looking forward to learn more about forces and motion. I have also some specific questions about this unit like what is motion? How does motion effect people? How many forces are? How many motions there are? What is effected by forces and motions?