Force, Mass and Acceleration...it's a Relationship xoxox

Here is the homework which I inadvertently  neglected to publish last Monday, so we will do it now.  My goal for you is that you understand this Second law so well that you will incorporate it into your mousetrap designs.  We will continue designing and building on Monday in class.  I will require you to have a written plan before you cut wood, including measurements,  seen by me.

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Thanks for class today; hope you enjoyed the art lesson.  Keep working on your designs, add measurements (how long are the side rails, how long the bed, what is the radius of the front/back wheels) and make it as accurate as possible.  Keep thinking about how to reduce mass and friction.  I will need to approve your plans before you cut.

Derek Owens, Video Tutor:  This is particulary important for the 7-9th grade students to watch, in order to understand Newton's second law at your grade level, including how to use it in an equation.  It is very good teaching, but unlike Bill Nye, it is neither funny, cute or annoying.  Probably much to your relief.  Watch the 2.3 segments numbered  2.3a-2.3f  It takes  about 30 minutes total in 6 segments, so break it up if you need to, and TAKE NOTES--pencils are the best brain-makers.  Younger students: this may or may not be difficult, but try anyway, and let me know how it goes>>>I want to test your limits!

Go here for the chapter 2 playlist, but be sure to watch only sections  2.3a through 2.3f:

 http://www.youtube.com/watch?v=Kc3TIJPe38k&list=PLWkr0FoP_-fS47nEZ7mJqXo9a7MoxeDJi&index=17   

or  else try here and watch continuously till you've finished all the way till 2.3f:    

   

I handed out a F=ma worksheet in class for you to  solve the problems.  Ask your parents or siblings for help if you need it.  Turn in on Thursday!!!  Using a calculator is fine, but follow my directions, and SHOW YOUR WORK.  -  -Write the formula you will use -- plug in the numbers with the units -- solve -- draw a diagram like Mr. Owens did in the videos.  The first problem is done as a demonstration of what I am looking for.  Here is a copy if you've already lost the one from class: http://www.nhvweb.net/NHhs/Science/gcollins/CP%20Physics%20Assignments/Newton's%20Laws/F=ma%20Worksheet%20A.pdf

You should already have read in your textbook Chapter 3, section one, which discusses friction as well as Newton's 2nd Law.  Read it again for review, and it should make lots of sense by now.

Lastly, some experimental stuff from TOPS to do at home -- find the "cards" 17, 18 and 19, cut out and glue in your lab books as discussed in class.  Build An Accelorometer (card 17) Acceleration Is Change (18) and if you have time and like puzzles, try Seconds Per Second (19), which is very challenging but optional.  Cards 17& 18 require a small jar; doesn't have to be a baby food jar--any  glass jar with lid should work fine. Keep the accelerometer for a while and get to know it.  :)  Like I said >>>  F=ma, it's a relationship.