Mon Feb 7, 2011

HW due tomorrow:
Hand in signed course expectation form
Hand in signed Parent Notification form
Cover textbook
Do Quia quiz on A1 General Knowledge
Try Quia quiz on Day 1 Review

Quiz tomorrow on Expectations.

Hand out:
Student Profile - Students complete and put in bin for 10 pts
Course Expectation Form
Student and Parent Form for Course Expectations - students return for 5 pts
Parent Notification Form - Students return one signed copy for 10 pts. (Keep the other at home since it has my contact info)

Go over Expectation Form in some detail
Quiz tomorrow on Expectation Form
Hand out Quia Passwords
Assign Quia Quiz on A1 - General Knowledge

Tried showing demos
Demo: Magic Jar
Plastic sheet stays due to air pressure
Idea: Air is made of matter - in fact, air is about 20% oxygen and 80% nitrogen
All matter is made of small particles called atoms

Demo: Stream of water is attracted to charged strip
Idea: This shows electrical nature of matter - water is the Mickey Mouse molecule with a plus side (at the ears, hydrogen) and a negative side (at the head, oxygen). The molecule rotates to present the opposite charge to the charged strip.

Demo: straw charged by sweater on plastic bottle. Straw is attracted to finger. Finger has water in it. Idea of charge polarization.

Demo: 2x4 attracted to charge ebonite rod. Also due to charge polarization.

Demo: Magic Jar
If I remove the plastic sheet, the water stays. This is due to cohesion (attraction between like atoms)
Showed diagram of origin of surface tension
Showed meniscus from water (adhesion greater than cohesion) and that of mercury (cohesion greater than adhesion)

Demo: Van de Graaff
Idea - like charges repel