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November 17,2004
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In physics we are still studying gravity but mostly of concepts and how it relates to objects.
During the warmup today some questions were "Would an elephant or a feather experience more air
resistance" and "Which hits the ground first, a tennis ball or a sand filled ball." At first I was
confused by the second question because I was thinking about gravity and how it acts the same for every
object, but decided that air resistance was a factor and knowing that a heavier object resists air
resistance better, I decided that the sand filled ball would hit first. Today the class was engaged
in a lab that focused on how things would work in "real life," such as how a marble would act when
a cart that it was on moved and how an observer would see its movement when the cart was jerked really
fast or if it was moved slowly.
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November 10, 2004
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Currently we are studying gravity and how it relates to forces. This includes the amount of friction
the ground exerts on an object and the amount of force the ground needs to use to keep the object on
it. An example of this is a box on the ground that weighs 1 kg. 1 kg is the same as 9.8 N of force
on the ground. So if the box is on a flat piece of ground, the earth pulls on the box at 9.8 N of
force and the ground pushes up with 9.8 N against the box. I'd say that it is a fairly interesting
topic, but I wouldn't want to bring it up at a cocktail party. At first I didn't get that the
ground pushed on objects at its weight amount straight up, but I thought it pushed up perpindicular
to whatever object it was on. Now I know however.
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