oct+24

Mr. Manning started class by reviewing the packet. In the packet, there were equations for different sets of information. For the first two equations of velocity, guidelines are specific, you can only use them when the velocity is at a constant speed.The fourth equation in the packet looks like a parabola, because of the t being squared. Anything squared looks like a parabola. On page 3 in the packet velocity is <-- = speeding up because Flash is going to the left. If the velocity and the accleration point in the same direction, it is speeding up. If they're in an opposite direction, it is slowing down.To find a final velocity, you have to use the third equation in the packet, a= (vf -vi)/t. After going over the packet, Mr. Manning had an experiment planned. He had a jar turned upside down with a string attached to the bottom of it with cork attached to the other end floating. (He gave us the option of recreating one of these for a possible 5 points extra credit if you go in a car around a turn with it and tell him which way the cork moves.) When the jar speeds up to the left, the cork goes to the left. When the jar stops, the cork goes to the right. This was confusing because of the law of inertia, but he explained that the water is being pushed backwards by inertia, so the cork results in forward motion. Inertia works on the heavier object, which in this case, water is heavier than cork.