Plans change...

Sadly, it seems we must delay racing our MTcars till after the holidays.  I tried out a couple of them at the tennis court this afternoon, and it seems not to be as good as I had hoped it would be.  Slightly sloped (so rain doesn't puddle) and too much friction, I guess.  So we will wait.  In the meantime, you may take yours home and fiddle, if you like, so long as you bring it back whole.  I think all the cars would benefit from increasing the traction, using balloons or gluing rubber bands around the wheels.  Reducing friction also, and aligning the wheels, shortening the string so it doesn't tangle or get caught on the hub may also need to be done.

Homework is the worksheet that was so difficult to print from last blog, but this time it needs to be completed, with the exception of where it asks for you to calculate speed, acceleration and momentum.  (Answer the questions where it says "Application," and also the page of the 3 laws.)  The worksheet does not leave sufficient room to answer the questions, so use a separate piece of paper, and write your answers in complete sentences. Type, if you can.

Also, if you did not complete the test, you need to do so as a worksheet and turn it in.
Thanks!

A little more Science...

Lastly, read again the handout about the science of mousetrap cars.  Print out this worksheet:  mousetrap car assessment and write in the definitions only, for now.

Understand these things: force, speed, friction, mass, acceleration, momentum, gravity, weight, and also how Newton's 3 laws apply to your mousetrap car.

It's a Test!

Homework due on Thursday is the Chapter 3 test, handed out in class. Here are the directions:
1. Review vocabulary, summary, and worksheets.
2. Take the test without books or notes. Use a pencil or regular blue/black inkpen.
3.  Anything you couldn't answer on your own, find the answer in the textbook --USE COLORED INK, like red or green or purple, and do NOT erase your original answer.  You will receive half-credit for this.
NO LATE WORK ACCEPTED.

 And here are a couple interesting science videos:

Reviewing Chapter 3 + Momentum!

Momentum...we use that term to mean "we're on a roll"- making progress, things are going good.  Webster's dictionary says its "the strength or force that something has when it is moving" and in physics the definition is "the property that a moving object has due to its mass and its motion."  The formula for calculating the momentum of an object is this:
meaning this:


And no matter what happens, we say that "Momentum is Conserved" -- which means the force that object has comes from...somewhere, and goes... somewhere, but never is it lost or destroyed. I think Bill Nye says it best...

Students currently learning beginning algebra (7th+) and youngers if you want, print out  this worksheet Momentum worksheet -  - I will post answers later today when I can get my scanner working. ...And here they are=> MOMENTUM answers

Last but not least, review all three sections of chapter 3 and fill in the worksheet from class, both sides. And here is the answer key: chapter 3 review answers

More on those 3 Laws...

An example of using math to find out something that would be impossible otherwise...(or maybe you are thinking it is the math that is impossible :p!

Weight, if you will recall, is a measurement of the effect that gravity has on an object.  Mass is how much matter an object has.  Calculate your weight in Newtons. (See page 77-78.   If you don't know your own weight in kilograms, multiply your weight in pounds by 2.2.  1 kilogram = 2.2 pounds.)  Write your weight ( in Newtons) in the comments.

 Watch these lecture videos on Newton's 3rd Law: 
Newton's 3rd Law- Derek Owens  -- Watch the 4 sections Chapter 2.7 a-d

Read textbook pages 83-85 and answer the multiple choice questions on this  3 laws worksheet:  http://www.jbgrimes.myclassupdates.com/sitebuildercontent/sitebuilderfiles/newtonsthirdlawws.pdf


Also, finish the 2nd page of the worksheet from class.
Now that you are really smart, here is some rocket science--