Physics 8-26-13 Velocity Problems 2

PHYSICS: Great job thinking through the problems today! Thanks for being so flexible there toward the end! (Thank you, Ryan!!)

Remember a few things: You weren’t born knowing how to do these – give yourself a little time. One the really good ones, just one formula won’t work – begin with writing what your know. These are some of the hardest problems we’ll work in physics – not because the formulas are hard, but because knowing how to reason through them is so challenging.

You are doing a great job! Now go work them again! I promise, it will be good for you. Remember, don’t open the solutions you wrote in your notes! Try them without it!! If you have to, peek, but then don’t stop until you can work the entire problem through without looking!

PHYSICS 8-26-13 Velocity Problems Review from Tammy Skinner on Vimeo.

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Chemistry 8-26-13 Derived Units & Density Problems

CHEMISTRY – So you think Goodman Road is getting crowded? How’s this for a “high density” city? Great job on the density problems today! Remember, in chemistry we use math as a tool, therefore we might work problems a little differently in chemistry than you do in your math class.

When working these problems, don’t forget to follow the problem solving steps we discussed today:

  • Analyze – write down what you’re given and what you’re looking for
  • Plan – write a formula where you isolate the unknown on one side by itself
  • Compute – plug in your data, numbers and units; then cancel the units, and if they cancel correctly, go on to the calculator. Be sure and give your answer what the correct units.
  • Evaluate – does your answer make sense, have you used the correct units, do you have the correct sig figs?

Wait – scratch that last thing, we’ll do sig figs tomorrow. Speaking of tomorrow, any questions about the thLAB: SI Scavenger Hunt? Bring your questions tomorrow and I’ll be glad to help!


CHEMISTRY 9-26-13 Derived Units & Density from Tammy Skinner on Vimeo.

flickr photo by chromogenic

Hon Chemistry 8-26-13 Density

HONORS CHEMISTRY – Hey guys, here’s a pic of some “high density” koi that I saw in Hawaii (at the Dole Pineapple Plantation, of all places!). Great job with the density problems – be sure and practice them tonight using the format I showed you in class today.

On a more practical side – and even better(!), can you now use what you’ve learned about density? Be sure and print off a copy of the lab, ID of an Unknown off the website. Who is going to be your spokesperson? Can’t wait to “watch” you work!

HON CHEMISTRY 8-26-13 Density from Tammy Skinner on Vimeo.