Friday, April 24, 2009 - Block 3

Didn't have time to grade the tests.

Did go over a couple of problems from the test.

Started Electrostatics

Showed analogy between gravity and electrostatics with comparison between Law of Universal Gravitation and Coulomb's Law.

Two types of charge, + and -
Like charges repel, opposite charges attract.

Charge is quantized. Smallest charges are charges of electron and proton.

Conservation of Charge - Charge cannot be created or destroyed.

Used the electroscope to show charge by friction and by contact.
Showed charge by induction - wrote steps on board.

Used the electroscope to determine charges on balloon and Van de Graff

Showed polarization using balloon on wall and changing water stream.

Students used Van de Graff.

Worked problems on Coulomb's Law.

Handed out worksheet on Coulomb's Law.
Handed out RA 21.1 due Monday.