Monday, December 6, 2010

Laws of Motion

Chapter three of Objects in Motion is Newton's Three Laws of Motion.  I collected several different demonstrations for this class, and thanks to The Happy Scientist, we demonstrated all three with a scale and some hand weights.

I created a worksheet so they could fill in all the different demonstrations we did during class.  I did a demonstration and then read from the book, did another demonstration, and so forth.

The First Law is that of inertia.  I placed a baseball card on top of a glass, and then stacked coins on top of the card.  I asked them to predict what would happen to the coins when I horizontally flicked the card away (they said the coins would fly off everywhere.)  Of course they dropped into the glass, and I let them try it a few times.  I also gave each of them some thick paper (bookmarks, actually) and a stack of pennies.  I instructed them to place the bookmark on the edge of the table so half of it was off of it and then to put a stack of coins on the bookmark.  They quickly pulled the bookmark out from under the coins and the stack remained intact on the table.  (The boys, of course, experimented with ways to make the coins spill...)

Another demonstration we did used a wheeled cart and a stuffed animal.  Shoving the cart made the toy fall off the back; stopping the cart suddenly made the toy fall forward.  We discussed the usefulness of seatbelts.

Finally, we wrapped up with The Happy Scientist: Newton's Laws that demonstrates all three laws in one activity.  You do not need a subscription to view this particular file, but I highly recommend it.  For $20 a year you get a wealth of videos, experiments, and science information.  Robert Krampf does a great job, and many of his videos are quite funny as well as interesting and informative.  All you need is a bathroom scale--the type with an analog display (digital won't work)--and a heavy object (hand weights work well.)  The kids are fascinated with how the scale changes as the weights are rapidly pushed up or pulled down.  Simple yet impressive!

3 comments:

Rebecca said...

I just wanted to encourage you to keep up the good work. I LOVE your site and it really fills a void for CM style homeschoolers looking for a variety of options with "living" science books. I have your blog saved to my favorites list and I plan on checking it often. We have already found a book from your Amazon list at our library and it is GREAT!

Shannon said...

Hi Kris,

I saw this on The Old Schoolhouse's Facebook page. I thought you might be interested. I think it sounds like their new Curiosity Files unit studies. http://www.facebook.com/theoldschoolhouse

The Old Schoolhouse Magazine Needed: We need a reviewer/endorser for a popular new unit studies series TOS has recently released. Looking specifically for an MD to read our MRSA title and endorse, if worthy. Also would like to share with a veterinarian for endorsement on other titles. Please email: gena@tosmag.com

Kris said...

Rebecca, thanks so much1 I am really glad you're finding lots of helpful information--may it bless your homeschool.

Shannon, thanks for the info. I emailed Gena to see of a PA-C would be O.K. instead of an MD (or presumably a DO.)