Physics 11-1-18 Friction & Normal Force

PHYSICS: Why don’t things that are moving just keep moving? Here is our intro on friction from today. Homework UPDATE for Thursday night: Pg. 146 – 149: 30, 32, 35, 37 – 39, 45, 47, 49

Remember a few key things. One of the most important – net forces produce acceleration.

You can find Ff a couple of different ways – it’ll be part of a net force equation and can be found from the coefficient of friction equation. If and ONLY if your object is moving at a constant velocity, Ff will equal Fa. Fn is only sometimes equal to Fw. If your object is pulled at any angle (or pushed), Fn will be a part of Fnet in the vertical direction.

Whew! 🙂


flickr photo by kbaird

Hon Chemistry 11-1-18 Moles of Chalk

CHEMISTRY: All kinds of ways to find the moles of chalk in your name! You set a land speed record for finishing a lab. Good job!

The book homework has changed for tonight and tomorrow night. See below if you didn’t get it in class. Also, the thLAB: Calculating MOles is to be written up as a formal lab report – pictures, etc. Be sure and change the formula for sucrose to the formula that is written in the notes on our syllabus.

Thursday HW Update:
Pg. 246 – 250: 28, 30 – 31, 42 AND do 31 and 42 AGAIN but change the directions to: “Find the number of molecules in each of the following.” (Do b and c only on all)

Friday HW Update:
Pg. 238: Blue Practice 1 – 3 (Middle of page)