Physics 8-28-12 … and the Tortoise & the Hare

PHYSICS: Just in case you need it, here is the solution to the tortoise and the hare problems – # 21 & 22. Remember a few things: You weren’t born knowing how to do these – give yourself a little time. 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! BYW – Don’t open the solutions you wrote in your notes! Try it without it!!

Tomorrow I’ll give you a break – we’ll work with the Sparkvue labs again. Thanks for helping get them set up!


Image source lolpictures.com

Chemistry 8-28-12 SI Density Problems

CHEMISTRY – So you thought Goodman Road was 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. And finally, 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 in a couple of days.

And who knew raisins could dance! I think you’ve done a lot of this already, but make sure you understand the conceptual side of density as well – that’s a hint for your conclusion!
🙂


flickr photo by chromogenic