2-12-09


 * The agenda for today was: Graded DQ, Reminder about HW, Lab Discussion, Conservation Notes.**


 * ~**The DQ today asked when it was appropriate to use W= (delta) Ek and W=(delta)Ep. The answer was that W= (delta) Ek is used with speed and movement and speed and W=(delta)Ep has to do with measuring highth from a specific reference level.


 * ~**After the DQ Mr. Manning reminded us of our homework which is the "I Wasn't Speeding" project that is due Tuesday.

**~** After the Homework reminder we discussed both "The Manning-Made Pile Driver Lab" and "Total Mechanical Energy Lab".

-We first reviewed the lab "The Manning-Made Pile Driver Lab". We looked at the table of data and it showed us that the resisting force for each hight and displacement is equal. After knowing this information we went over the questions on the back. The answers are as follows: 1. The forces remained the same because it's still the same wood and nail. 2. Yes it would remain the same. 3. The displacement would less because there is less potential energy on mars. 4. The new displacement would doubled.

-We then reviewed the other lab, "Total Mechanical Energy Lab". We just went over the answers on the back. The answers are as follows: 1. All of it was lost. a) All of the energy from Ep was gained by the Ek. b)Error due to friction and stop watch mistakes. 2.Equal because all the Ek gained all of the Ep. 3. Ep(top)+Ek(bottom)= Etot (total) After going over this lab he collected it!

-We then looked over the conservation note sheet we had picked up in the begining of the class, labeled page 8. We read it to ourselves and filled in the answers by going around the room and reading the paper one sentence per person. The answers to the blanks are as follows (in order of how the paper reads): 1. Potential 2. Earth 3. Gravitational 4. Potential 5. Hight above the Earth 6. Kinetic 7. Speed 8. Potential 9. Kinetic 10. 784 11. 549 12. 235 13. 7.67 14. 235 15. equal



This ran all the way to the bell and concluded class!