By popular request....

Some more practice problems:

chapter 9:  66, 68

chapter 8:  45, 67, 88

For next class, work out these problems (if you wish) and also the details from the ballistic pendulum part of the experiment (if you took data today).

HW

For next class, bring any changes to the rocket design - anything you wish to pursue.

Also, problems to try:

Chapter 9:  80, 81, 77, 69

To recap, the practical problems we'll be examining over the next few classes are:

rocket (vertical)

rocket (horizontal)

ballistic pendulum

1-d collision (dynamics track)

2-d collision (air table)?

bowling ball pendulum?

This will a formal lab.

We will also have a take-home test on all things energy, momentum and vector.

HW

We are covering chapter 9 now.  Start reading:  9.3 - 9.10.  Next class,we'll cover momentum and its conservation.  If you want a heads-up, get to the collision sections  (9.9 and 9.10).  We'll do some collisions in class as a lab next week.  I predict awesomeness.

Problems to try:  8.38, 8.41 (calculus-y problems, I think)

Did you get the Tarzan problem (8.25)?  We didn't go over it in class today.


For those of you thinking ahead.  We will have some manner of test before too long - something that covers energy and momentum.  Probably 3-4 problems.  It *may* be a take-home test.  I'm not sure yet.

Energy HW

Chapter 8 (problems starting on 190):

8
More importantly, consider this problem as follows:  What is the minimum height (h) as a function of radius (R), such that a block released from rest will "just make" it around a loop-the-loop.

(Answer = 2.5R)

21
25
27
53
63

Enjoy!

3d Vector problem

A = 4i + 2j - 3k
B = 6i - 4j + 1k

Find:

A (magnitude)
B (magnitude)
A - B
A dot B
angle between A and B
A X B

i dot i
j cross j
k cross j
North cross Up