Work it out, middle schoolers!

Vocab for this week's quiz:
energy
work
potential energy
kinetic energy
joule
f=ma
a= vf-vi
     tf-ti
w=fd

Bernoulli Effect

Bernoulli tricks... try at home.

http://www.youtube.com/watch?v=P-xNXrELCmU

Assignment for 10/5

So, velocity is a lovely thing, no?  I particularly like the thought of escape velocity.  This is the speed in an upward direction you need to achieve to escape a planet's gravitational field.

To escape Earth, you need to be going over 25, 000 mph.  Yowza.

Can you put the following escape velocities in the order of the nine eight planets starting with Mercury?    Good luck.  Do a little thinking, you will do fine.  Hint: Size is a factor.  Due Friday 10/5 with your quiz.  You gotta get one easily-- the third one is done for you. :)  Happy rocket science to you!

23, 175 MPH                          1.
52,702 MPH                           2.
9, 507 MPH                            3.  Earth  25, 031  MPH
47, 826 MPH                          4.        
11, 252 MPH                          5.
134, 664 MPH                        6.
25, 031 MPH                          7.
80, 731 MPH                          8.

Slinkies, terminal velocity, and Bernoulli, oh my!

Terminal velocity sounds like deadly force, but it's actually another cool point to consider about how marvelously our world works.  My crazy thank-you  about it?   I keep imagining anything like hailstorms or even raindrops would be somewhat more...painful without those air molecules and low pressure/high pressure influences creating drag to slow things down.   Here's the video that LV suggested.  Disclaimer: obviously a very secular Youtube channel.  I have no control over the ads or suggested videos that pop up.  Yeah, robot weirdos, I am talking about you! Disregard and hit the video.

http://www.youtube.com/watch?v=p0IZsfzDS4s     (again, cut and paste in your browser if it doesn't highlight the link. )

and here's the levitating slinky.

http://www.npr.org/blogs/krulwich/2012/09/11/160933582/the-miracle-of-the-levitating-slinky

Hopefully I can get out our own levitating slinky shots up soon!


Next up:  Bernoulli and fluid forces! Can you hover a ping-pong ball over a hairdryer?

Khan Link to Balanced and Unbalanced Forces

Take a little while to watch this excellent primer on balanced and unbalanced forces.   I would be much obliged if you would take the opportunity to write down three things you learned or three questions (no such thing as a dumb question) or a combo of these things after watching the video and thinking about what you viewed.
  If the link doesn't activate (appear in blue), then copy and paste it into your web browser.

http://www.khanacademy.org/science/physics/mechanics/v/balanced-and-unbalanced-forces

Enjoy your weekend!  See you in the morning.