Advanced Physics I (AP-C)
updated: 12/03/08 11:50 AM
Week of
 11/17/08		 Syllabus Course Expectations Safety, Honesty, & Lateness Policy Next week Last week
have you done 10 -15 problems from chapter 11?
(by the end of the week)
  Due Time Sunday Monday  Tuesday Wednesday Thursday Friday
class         no class

 

  
reading
 		 before
class,
except on Wednesday		   11(6 - 8)

make sure that you have done all the checkpoints up to this point in chapter 11

also do some question practice

be thinking about which moments of inertia calculation you would like to do

(you can reserve one if you have completed it)

 11(9-10) &

12(1-3),

sections 11(9) & 12(3) are of immense importance

 questions that you now know the answer to about an extended object rolling down the plank:
 
why did two forces contribute no torque?

which gets to the bottom of a ramp quicker?  disk or hoop?

why does friction act up the ramp if the object accelerates down the ramp?

does the mass of the rolling object matter in determining which object reaches the bottom of the ramp first?
does the radius matter?
......
unfortunately, the issue of the definition of the positive defintion in that derivation only came up in one class & I never followed up on it.... what HRW did in 12(3) violates our most basic rules about defining positive, and you should have rewritten the entire derivation with the sensical definition of + (and which would then prevent the negative silliness in HRW's equations 12-9 and 12-10)... if you haven't done it, that's another thing for your to-do list...

and what if the object starts with an initial speed at the bottom of the ramp and rolls up?

is friction now up or down the plane?  why?

mastering the answers to all of the questions above (and similar questions for tomorrow) is far more important than perfecting a beautifully written copy of the today's single AP problem.... and a far more important determiner of your likely success this trimester than the score you will get on today's turn-in problem
 12(3,4,5)

what is the speed of an extended rolling object [such as the one in section 12(3)]
at the bottom of a hill of vertical height h....

there are two ways to do this problem; you should be able to do both for class today

 practice on moments of inertia...

bring one to class?
homework 8 AM            
class    11(6, 31)       some problems from chapter 11 (or early 12) that you've picked out because you have found them interesting....

and did you prove that work done by a torquing force equal the change in rotational KE
 you bring a moment-of-inertia calculation to class to show
 5:30 pm question 2 of the final exam:
parts
d & e, each done 2 different ways

(make sure that you don't have negative signs on things that aren't vectors)

     AP set 15

(1 problem)


re-done test question(s) due;
remember to attach your final exam papers

   AP set 16
do the 2nd problem first
lab 8 AM            
class            
5:30 pm     Elab 3 including extension is due(one report per group)

check this before turning in your assignment to moodle


     Hlab3 is due
other         Multiple Choice Practice on Chapter 11