Howdy Fellow Bloggers!

Today we didn't do much of anything that is new.
What we did was work more on the lab worksheet we were given on December 12, aka Friday. I believe that is due tomorrow, but that is just an assumption.

We were also given the answers for "Concept-Development Practice Page 13-1 -- Chapter 13: Gravitational Interactions", so here they are:

1. An apple that has a mass of 0.1kg has the same mass wherever it is. The amount of matter that makes up the apple
DOES NOT DEPEND UPON
the location of the apple. It has the same resistance to acceleration wherever it is -- its inertia everywhere is
THE SAME.
The weight of the apple is a different story. It may weigh exactly 1N in San Fransisco and slightly less in mile high Denver, Colorado. On the surface of the moon the apple would weigh 1/6N, and far out in outer space it may have almost no weight at all. The quantity that doesn't change with location is
MASS,
and the quantity that may change with location is its
WEIGHT.
That's because
WEIGHT
is the fore due to gravity on a body, and this force caries with distance. So weight is the force of gravity between two bodies, usually some small object in contact with the earth. When we refer to the
WEIGHT
of an object we are usually speaking of the gravitational force that attracts it to the earth.

2. If we stand on a weighing scale and find that we are pulled toward the earth with a force of 500N, the we weight 500N. Strictly speaking, we weight 500N relative tot he earth. How much does the earth weight? If we tip the scale upside down and repeat the weighing process, we can say that we and the earth are still pulled together with a force of 500N, and therefore, relative to us, the whole 6 000 000 000 000 000 000 000 000-kg earth weighs 500N! Weight, unlike mass, is a relative quantity.

Hmm, that seems to be it.
OH, also, if you are bored read pages 5 and 6 for tomorrows class in the Dynamics booklet. And tomorrow we have another lab, so don't miss it!

The scribe for tomorrow shall be... Anthony L!
Toodles!