Today you'll have a chance to start bringing back some of the basics of momentum, p = mv. Keep in mind that it is a vector, so direction matters - it is positive if something is moving to the right, and negative if it is moving to the left, for example.
Momentum is conserved, so for a vector this means that x-momentum before and after a collision is the same for a system, and the y-momentum before and after a collision is the same for a system.
The change in momentum for an individual object is its impulse, delta(p). We can find impulse a few ways: delta(p) = mv_f - mv_o = F*delta(t). Delta(t) is the time of contact between the object and whatever it is colliding with.
Please watch a short video on why momentum is conserved, which is due to Newton's 3rd law. To start getting some practice, please start trying:
Chapter 8, Questions #8, 19 and Exercises #5, 7, 9. These are all on page 3 of your packet. If you want to get a head start on the AP problem on page 8, go for it since we will eventually do it.
With any remaining time, you can be sure to complete the reflection and article summary if you need to. Feel free to use the Scientific Americans in the back of the room. You should also be sure to go through and understand anything you missed on the free response from the final - solutions are on the 3 Chem-Phys page of our school site.
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