# Physics 11-15-11 Intro to Work

PHYSICS: Funny thing about words, all this work you thought you’d been doing, was it? Work, I mean? Great intro to chapter 5! Jakin, I think you almost did move the lab station! π And I think you’ll all do great with the work problems, just remember everything from the last chapter and multiply by d!

BTW – Did you figure out what to do with the conveyer belt problem from the end of class? Why were you supposed to subtract?

# Physics 9-1-11 Acceleration, Pt. 2

PHYSICS: Hey guys, here’s the last of the acceleration formulas. Good job with the derivations! You’re doing really well with them – stay with it! Carefully examine what you know with the formulas you have that might fit. And if they don’t, examine what you do know that could lead you to what you need to know. You know? π

Tonight’s problems might be a little challenging, but you can do it!! Do you need some extra practice rearranging the formulas, or just working the problems? Help session next Tuesday morning. Somebody better text me!

flickr photo by labanex

# Physics 8-31-11 Acceleration

PHYSICS: Great intro to acceleration! How do you feel about the formulas you helped me to derive? Go ahead and start the homework, and we’ll finish the last formula tomorrow – yes, there’s just one more. I think you’ll come to find these are a ton better than some of the velocity problems you did. List what you are given and what you’re looking for – don’t forget things like “starts from rest” and “came to a stop.” Then, just find the formula that contains the variables you are looking for. Easy peazy! Okay, maybe not that easy! π

# Physics 8-29-11 … 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 solution to number 7! Try it without it!!

Tomorrow I’ll give you a break – we’ll start acceleration. I think you’ll find that it’s a whole lot simpler – all you have to do is practice using some formulas! Did you hear what I said? Formulas!! π Not simple mind you, but you’ll be surprised how much you’ve already learned. I’m proud of you!!

Image source lolpictures.com

# Physics 8-26-11 Velocity Problems 2

PHYSICS – Velocity problems from Thursday – you’re doing a great job on these! Let me know how the take home lab is going for you. I think it will be a good break from your typical type of homework!

Good luck on those five problems. Try not to look at your notes, but if you do, work it again without your notes! And make sure to do more than just show the math – be sure that I can also follow your logic in the formulas. Ditto with units, etc. Don’t give up on the tortoise and the hare. A couple of hints: remember the distance the tortoise travels is the same as the distance the hare travels plus the extra 20 cm he was ahead. Also, the time the hare raced is equal to the time of the tortoise minus those two minutes he rested. Now go have fun! π