Janna's Scribe Post for November 16th 2010 !

Hey guys for today's class we got back our Energy in a Trebuchet worksheet & our questions 3, 4, and 5 that we were to do out of the Green Textbook.
Next we went over our Chapter 8 Study Guide and filled in the blanks in the Universal Gravitation, Newton's Use of His Law of Universal Gravitation & Weighing Earth paragraphs on the first page of the study guide. The answers can be found in the slide post directly below my scribe on the first page of Mrs. K's post. Then we went over the answers of the first three pages in the Chapter 8 Study Guide Motions in the Heavens and on Earth booklet. Again, these answers can be found in Mrs. K's slide post from page 2 on.
After going over the answers we picked up 3 worksheets: Universal Law of Gravitation, Chapter 7 Transparency 7-2 & Chapter 7 Transparency 7-3. If you were away make sure you pick up these worksheets ASAP and do them for we will be going over the answers in class tomorrow. =)

Homework:
- Universal Law of Gravitation
- Chapter 7 Transparency 7-2
- Chapter 7 Transparency 7-3

Happy Homeworking !! :)

Janna's Scribe for October 4th, 2010

Heyy everyone,

to start off class we watched a video that explored the concepts on impulse and momentum.

After watching the short video we went over the answers to the Chapter 9 Study Guide. The answers are as follows:

Section 9.1: IMPULSE and MOMENTUM

1. B

2. B

3. B

4. A

5. D

6. B

7. D

8. B

Next we went over the IMPULSE AND MOMENTUM sheet

1. WILL BE POSTED LATER

2.

a) m=Fg/g

=900N/9.8N/kg

=92kg

F∆t = m∆v/ ∆t

= (92kg)(2.0m/s)/ 0.70s

= 260N

b) p=m∆v

= (92kg)(2.0m/s)

=184N

260N - 184N =76N

3.

a) Ft =mv

=(51kg)(20.0m/s)

= 1020kg . m/s

b) F = mv/t seatbelt

= 1020kg.m/s/ 0.12s

= 8500N

F = mv/t noseatbelt
= 1020kg.m/s/ 0.008s
= 128000N

ALWAYS WEAR A SEATBLET WHEN IN A VEHICLE !!

Don't need to do #4

Next we watched three short clips regarding the momentum of a ball, recoil and the conservation of momemtum.

KEY CONCEPTS:

Remember momentum before a collision is equal to the momentum after a collision occurs.

For every action there is an equal and opposite reaction.

Homework:

Transparency 9-1 and 9-2 are due on Wednesday in class.

Have an awesome afternoon off !!! :)