october 12 scribe

October 12 2010

hi! today, we went over the Transparency worksheet.

Then miss K review a little about momentum (elastic, explosion, inelastic).

After that we have a lab with money :) and hand in after class.

Sorry!!!!!!! i don't know how to put answers or picture up. If you needed you can ask miss K

Oh yeah! we picked up study guide "Motion in Two Dimensions" and a graph. Take a look we'll go over it tomorrow...

October 7

On Thursday, we went over the answers to the Chapter 9 Review worksheet.

Here are the answers:

1: 1600 N

2: 0.0013 s

3: 6700 N

4: 0.05 m/s [W]

5: -8.8 m/s

6: 81 m/s

7: 5.7 x 10^-2 m/s

8: 6 kg m/s

We then went on to finish the momentum unit by looking at momentum in two dimensions. These kind of problems involve finding the missing side of a triangle using a combination of the Law of Conservation of Momentum and trig ratios.

For homework, we got the Chapter 7: Momentum and Transparency 9-3 worksheets do.

Momentum Notes

Momentum

View more documents from ekozoriz.

Pool Table Applet

Pool Table Applet

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 !!! :)

Friday - October 1

Friday's physics class was basically a chance for those who missed the momentum lab on Thursday to do and finish the lab.

For those of us who were in class on Thursday, our task was to finish and hand in the lab.

So, reminder to those who didn't finish or forgot to hand in their lab, it is now over due!!



Next thing on our to do list was to check the answers from Wednesday's questions from the duck book.

Basically, to find the momentum from a given force vs. time graph, we find the area under the given line.

If the line creates a triangle, its area can be found using the equation area = (1/5)(base)(height).

If the line creates a rectangle, its area can be found using the equation area = (base)(height).

If the line creates an irregular shape, simply cut up the shape into pieces of triangles and/or rectangles and find each area using the equations from above. (Don't forget to add up all the areas in the end).


The rest of the class should have been spent on doing questions 1 - 4 of the Impulse and Momentum worksheet.

If you did not get a chance to finish it in class, please do it for homework!



Enjoy the rest of your weekend!!!
-- RAINER

September 29, 2010

Hello.

Today in class we finished up the video about Momentum and handed in 5-7 facts about it. Then we went over a few notes on deriving the impulse-momentum equation from Newton's 2nd law.



To go over it, the notes were;

There were also questions in the textbook;
pg287 question 6

pg308-309, questions 50-51


Check Your Answers.
On pg287: Find the impulse:
6. a) 125 N∙s [S]
b) 1875 N∙s [W]
c) 45 N∙s [W]

Pg208-309: Find the Impulse.
50. a) 1750 N∙s
b) 6∙10^-1 N∙s
c) -225 N∙s

51. 22.5 N∙s



*Sorry for the late post.

Momentum - September 28, 2010

Hey Grade 12's!
Today we started the class off by doing the "Dynamics" test corrections on the smart board which Ms. Kozoriz will post sometime today I believe. After that we began our new unit "Momentum" by watching a film about it, we were told to copy down 5-7 facts that we personally found interesting to us but since we didn't finish the whole film we are going to continue watching the rest of it tomorrow.
Enjoy the rest of your evening! :)