Tuesday, May 19, 2015

Solar System Scale Assignment

Today in class we will start an assignment where we will represent the planets to scale both in terms of diameter and in terms of distance from the Sun. Here are the requirements:

  1. A horizontal scale where 1AU = 20 mm starting from the edge of the Sun going out over 30 AUs, marked every 5 AUs.
  2. A vertical scale at where where 100,000km = 20mm starting from the center of the Sun.
  3. All the planets represented appropriately in terms of color and rings

Monday, May 11, 2015

Weight and Mass

What's the difference between weight and mass?

As long as you stay on Earth, the difference is more philosophical than practical.

Uh...what do you mean by that?

Well, mass is a measurement of how much matter is in an object; weight is a measurement of how hard gravity is pulling on that object. Your mass is the same wherever you are--on Earth, on the moon, floating in space--because the amount of stuff you're made of doesn't change. But your weight depends on how much gravity is acting on you at the moment; you'd weigh less on the moon than on Earth, and in interstellar space you'd weigh almost nothing at all.

But if you stay on Earth, gravity is always the same, so it really doesn't matter whether you talk about weight or mass.

That's right...but scientists still like to be careful about distinguishing between the two. If you talk about the mass of an atom--as I will do from now on--you're always talking about the same thing; if you talk about its weight, what you mean depends on where the atom is.

Source: http://www.colorado.edu/physics/2000/periodic_table/mass.html

Wednesday, May 6, 2015

Sun, Earth, Moon Concepts

  • Shape and time of Earth’s Orbit
  • Earth’s rotation and Day/Night relationships
  • How to calculate Time Zones using a map
  • Tilt of the Earth during different Seasons
  • Direction of Shadow at different times of the days and hemispheres
  • Length of Shadows at different times and latitudes
  • Phases of the Moon
  • Solar Eclipses
  • Lunar Eclipses