1.5.09

Ahhhh the first day back to school after a long break is anything but fun. Despite the fact, its a Monday morning in the physics room of Manning. This being the first day back since December, it was time for a new chapter (Chapter 6: Impulse and Momentum). Walking into the room Mr. Manning had three handouts waiting to be picked up. They consisted of the following: Unit 6 Reading Guide, Momentum & Impulse Notes (pgs. 2- 4), and Impulse and Momentum Questions (pgs. 5- 6). Mr. Manning began teaching the class this new chapter. The topic for todays' lession would be about momentum. Momentum is a property of a system and it tells how difficult it is to stop an object. Through out the class I was able to learn that momentum depends on the mass and velocity of an object and that the greater the mass or velocity an object has the more momentum it contains making the object harder to stop. He also stated that momentum is a vector and the symbol for it is represented by a capital P with an arrow over head (1.). To calculate the momentum we would use the formula(s) ( 2.) to solve the problem. Furthermore a change in momentum can be caused by a change in mass, velocity, or even both. He also gave us the formula to calculate the change in momentum of an object. (3.) Last but not least Mr. Manning taught the class a little bit about impulses (4.). Stating the fact that an impulse is a vector that causes a change in momentum. In order for there to be a change in momentum there must be a change in the impulse given to the object also. With the bell about to ring we were informed that there was no homework for the night.

Example:

Remember: 1. The longer the force acts (greater time), the greater the velocity and therefore a greater change in momentum. The greater the force is the greater the velocity and, therefore, the greater change in momentum

2. Whats the difference between momentum and the change in momentum? momentum- the mass/velocity of an object (instatanious) change in m.- the change in mass/velocity

3. Units/ Calculation momentum: kg x m divided by s impulse: Impulse= sigmaF X delta t (N *s)

4. How to change the impulse given to the system? Change sigmaF or delta t.

pd- uno
 * Aura Tremellen :D**