Tuesday, March 5

With apologies and frustration, I cannot join you today. Please try the following:

Period 3-4, 8-9
Complete the chart we began yesterday by checking out this introductory video on rotations. Then, check out how to find torque and equilibrium. Take some notes on the examples, and then you can break into groups to try and complete the practice problems below. Tomorrow we will get into a lab where you can see all the rotational quantities in action.

Ch. 9 #3, 5   on page 5
Ch. 10 #1, 2 on page 7
Ch. 11 #13 on page 7


Period 5
Static electricity labs should be done and turned in.

Using what we were saying about induction and polarization yesterday and last week, in small groups try and complete the first three pages of the static electricity packet. These include the vocabulary and chart of insulators and conductors for the first page, rule of electric charges for the front and back of the second page (attraction and repulsion), and charging by induction for the front and back of the third page. For extra credit, try the fourth page that deals with lightning. Feel free to use either video from the E-day (video 1, or video 2). If you try the lightning page, it will ask about the electric force between charges. There is a formula that looks and behaves like the formula we used for gravity. This is:

F = kQq/d^2

The k is a number, k = 9 x 10^9 = 9,000,000,000 (9 billion). The Q,q are symbols for electric charge, which has a unit called a coulomb, C. Notice it is divided by distance-squared, just like gravity. If charges are twize as far apart, the electric force is 2^2 or 4 times weaker, etc.

Answer keys for the packet is in the Electricity folder on our school website.