Circular Motion

Hi everybody!!! This is Hao : ) HAHA, Spring Break is coming. So I wish everybody will have fun and don't forgot check this blog. I try to post some useful information on this blog everyday. Today, i am so lazy so just post the answer link of " Free -Body Exercises: Circular Motion" sheet.

http://www.slideshare.net/ekozoriz/circularfbd

WHAT EVER YOU WISH TO CALL THIS...

hey everyone sorry this is a bit late.

okay we started a new unit on monday where we were introduced to PERIODIC MOTION.

you should have finished the first paragraph of chapter 7, section 2 study guide but just in case here are the fill ins for the blanks:

constant

changing, changing

perpendicular, tangent

instantaneous velocity

length

radius, centre

centripetal

directly, inversely

second

force

centripetal force

straight, tangent

ALSO please finish the two worksheets the were given on tuesday or monday...i don't remember when but it was surly this week?!??

AND HAO BECAUSE YOU ASKED SO NICELY YOU CAN SCRIBE NEXT

PHYSICS!!!! YAAARGH!!!! (:

Ok so now that the Fashion Show is finally over (I hope you guys came to watch!), I can finally start and/or finish this scribe post! Ok so it's pretty late and I don't really want to surprise anyone by telling them they are scribe so I might as well just finish the week right? So I'll just gather my information for tomorrows class and scribe for then too. However there is a piece of information that I must share with you.


The next unit test (Momentum and Projectile Motion) is on MONDAY!!!!


Yup, Monday. So study study study!


For now, it's jayp signing out. (:

Ok so now it's time to review what happened this week.

Tuesday, March 16th
Ok so Ms.Kozoriz wasn't here this day (and unfortunately neither was I) but from my understanding, we just got a few sheets to work on. I will go over the answers to the sheets in just a moment.

Wednesday, March 17th
Once again, Ms. Kozoriz was away. Again, I believe we just got some more sheets to work on as well as getting time to work on the previous sheets. Please, correct me if I am wrong.

Thursday, March 18th
Ms. Kozoriz came back. I believe the answers to Projectile Motion 1 and the Chapter 7 Review were gone over. Projectile Motion 2 (back of Projectile Motion 1) and textbook questions were assigned. If you happen to have a textbook with you, the questions were at the end of Chapter 7 (page 152) Problems 6-10. The answers will be gone over later on in the post.

Friday, March 19th
All went back to normal this day. The class was filled and physics continued to roll onwards. The answers to Projectile Motion 2 and the textbook questions. We also listened to another physics song entitled "Harry the Human Cannonball". It was a song about a man who won a woman's heart by applying the concepts of projectile motion. We also got a wordsearch and one of those fill in the blanks sheets for Periodic Motion which we are of course to complete. Also, don't forget we have a TEST on MONDAY on MOMENTUM and PROJECTILE MOTION!

OK so now I will go over the answers for the various sheets we have recieved. Let's start with Projectile Motion 2 (since Projectile Motion 1 is on the site already with explanations and correct answers).

*links to explanations are currently not working. will be up soon*

1)141.2m
solution

2)10.6 m
solution

3)a) 4.42s
solution

3)b)55m
solution

4)70.0m/s
solution

5)a)16.51m/s
solution

5)b)10.02m
solution

Next we move on to the textbook questions:

6)6.5m/s
solution

7)3.17m
solution

8)a)30.6m
solution

8)b)212m
solution

9)30.99m/s
solution

10)a)0.2s
solution

10)b)8.7m (win)
solution

Lastly the review (only the front page because we haven't dealt with circular motion yet).

1)0.25m
solution

2)7.8m
solution

3)a)6.5s
solution

3)b)210m
solution

4)a)0.82s
solution

4)b)N/A
solution

Ok so now just a couple pointers to remember for the test.

Ft=impulse
mv=momentum

impulse=momentum
Ft=mv

momentum = kg*m/s

momentum before collision = momentum after collision (in an isolated, closed system)
in a non-sticky collision (elastic)  m₁v₁+m₂v₂=m'₁v'₁+m'₂v'₂
in a sticky collision m₁v₁+m₂v₂=(m'₁+m'₂)v'

When net force is equal to 0, change in momentum is equal to 0 (in a closed system).

Adding momentum vectors is like adding normal vectors.

Horizontal velocity (for projectile motion) is constant.
Vertical velocity (for projectile motion) changes accroding to g*t (V_v=gt)
V_vf=V_v+gt
d_v=(1/2)gt²
d_h=v_h*t

OK! Well good luck everyone! Study study study! And get lots of sleep and/or rest! (:

Good luck and see you in class my fellow future physicists!

jayp, signing off!

P.S. You get the privilage of being the next scribe...........(drum roll)

Muhanad!

Congrats! You name was pulled out of the hat! Have fun! (:

Projectile Motion 1 Answers

Projectile motion 1 answers

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PROJECTILE MOTION

Hey everyone, this is Karen.

Anyway, it slipped my mind that I had to scribe, so I'm only doing to now. On Friday, we learned about Projectile Motion.




We learned that an object that is thrown or released has no horizontal force acting on it, therefore, there is no horizontal acceleration. Also, both a thrown object and a released object are accelerated downward by the force of gravity.


In class, Ms. K gave us a sheet that shows two spheres falling, one with a horizontal force and one without one.. (I'll add the picture later when I find the cord for my printer)
Also, she gave us the Chapter 7 Study Guide. And a worksheet called Projectile Motion I and on the back side is Projectile Motion II.



We haven't finished the Projectile Motion worksheet, and I think she expects us to have it done for tomorrow.
The answers for the Chapter 7 Study Guide is in the slide share uploaded by Ms. K.





That's pretty much sums up friday's class. The next scribe is jayp

Projectile Motion

Proj Motion

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Momentum & Impulse

Hi guys! In today's class, we just corrected the sheet Chapter 9 and Chapter 9 questions 16-19 on the green book.

Chapter 9 Review:

1. 1600 N
2. 1.3x10ˉ³ s.
3. 6 700 N [W]
4. 0.05 m/s
5. 8.8 m/s [W]
6. 81.25 m/s
7. 0.058 m/s
8. 10 kg·m/s, 36.9° [E of N]
9. OMIT


Text Book Chapter 9 (#'s 16-19):

16. a) 779 kg·m/s
b) -779 kg·m/s
c) -779 kg·m/s
d) -6.0x10ˉ⁴ kg·m/s
e) -6.1 m/s

17. a) 0.001 kg
b) -6.0x10ˉ⁴ kg·m/s
c) sorry, i didn't get the answer for this one.
d) 1.6x10ˉ³ kg·m/s

18. a) -100 kg·m/s
b) -500 N [S]

19. 10.83 m/s


Reminder: Hand in Impulse and Momentum/Conservation of Momentum sheet by tomorrow. First 3 questions on each pages are to be marked. Show all your work.


Next scribe is RENSTER :)