Ms. D's Challenges

Hi everyone! This is the first scribe post of the 3rd quarter!

First of all, I would just like to remind everyone that blogging is different this quarter. The scribe post should be the same as last year, but you should only make two minor edits to our blog - NO MAJOR EDITS!!! You should make one minor edit to one of the Canadian blogs, and one minor edit to the 8th grade blog!

The Canadian blogs' URLs are:

http://room72math09.blogspot.com/ ,

http://room44math09.blogspot.com/ ,

http://room43math09.blogspot.com/ and

http://room42math09.blogspot.com/

The URL to the 8th grade blog is http://aisz810.blogspot.com/

Today we made force diagrams. Ms. D helped us draw and she gave us some names of forces acting on the boxes: gravity, air pressure, air resistance, and the force of push/pull.

After that Ms. D gave us some challenges. We got a beaker, five coins, an Erlenmeyer flask, an embroidery hoop, and an index card. For the first challenge, we were supposed to first put the index card on the beaker, then put one gold coin on it. We were supposed to get it in the beaker without just bending the index card so they come in. After that we did the same thing but with the silver coin, and after that two coins, and finally with five.

For challenge number two we did the same thing as for challenge number one, just with an Erlenmeyer flask instead of the beaker.

For challenge number three we were supposed to get the gold coin, silver coin, two coins and five coins in the Erlenmeyer flask but without using an index card; we had to use an embroidery ring instead! We put the embroidery ring standing up on the Erlenmeyer flask and then we put the coin(s) on top of it and we were supposed to get them in.

The questions for the challenges, that we have to finish for homework, are:

Challenge one:

• Draw a labeled force diagram of the coin when it is on the index card over the opening of the beaker.
• Why can you do this? Explain it in your lab notebook using the words force, Newton's First law, gravity, inertia and anything else you feel is appropriate.

Challenge two:

• Was this harder than getting the coins in the beaker? Why or why not?

Challenge three:

• Draw a labeled force diagram of the con(s) when they are on the hoop, above the flask.
• Did you get this trick to work? Why or why not?
• Using the idea of Newton's First Law, explain how this trick works. Think about the words you should include.
• Finally, using Newton's First Law, explain how a magician can remove a table cloth from a table with things on top of it. (Try doing this without using your book for help!)

The next scribe is........................

NOAM!!!!