Momentum & Projectile Motion Test Answers

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1 - Scribe - October 10, 07?

Sorry for the late post. Well, we watched a movie on momentum by the S.S. guy. (SAME SAME!) We were instructed to right down 10 points on what we learned through the instructional movie.

Some 10 points include:

*Momentum: is not mass or inertia; it is (M)(V); how fast something is moving.
*acceleration = (force)/(mass); newtons second law.
*a=(ΔV)/(Δt)
*FΔt=Δmv
*Δ = change in (delta)
*(F)(T)= impulse (Δ momentum)
*if you want momentum to change you change the force.
*3xForce = 3x Momentum
*Reason for pulling elastic band out? Creates a bigger force and longer force making the object travel farther.
*Which canon is more effiecient? The canon that is longer, it has more time, so it goes farther.
*riding w/ the punch both same in dir moes with less spd. is wrong.
*when you pull back ti increases time, so the time of impact is longer.
*bouncing gives alot more momentum.

That is it for now.

Momentum Questions

We covered Ch.9 Review on momentum. We also went over the problems on the Impulse & Momentum worksheet. Two additional worksheets were handed out-these are due for Monday.
Remember to do the catapult project for Monday, Oct.22.
Have a nice weekend. Thanks to Ms K for wordprocessing this. (you're welcome)
Kristin's the next scribe for Monday.

Scribe Post For Friday...

woww.. sorry for the super-delayed scribe post. should've figured I was scribe after Sergio was on Thursday. Well, this is going to be the most strain I've put on my memory since a long time. On Fridayy.... we worked on our lab; CONSERVATION OF MOMENTUM: A COLLISION IN TWO DIMENSIONS. On the side of our tables, we clamped little ramps that consisted of a ruler-measured ramp, a set-screw and a plumb line (a string with a weighted tip). We used the plumb line to determine Point Zero on four sheets of paper & carbon paper that we taped together and layed on the floor.We then rolled the steel spheres off the ramp at 25 cm from the edge of the ramp several times to determine the Original Momentum (simply rolling the sphere off the ramp several times, no collisions) and circled the area where the most dots resulted by the sphere landing on carbon paper. Then we placed a second steel sphere on a set-screw, and after making sure the two spheres will be at the same height when they collided, we rolled the incident sphere down the ramp another several times. We then circled the bunch of dots the same way we did when we figured out the Original Momentum of the sphere. Afterwards, we drew lines that connected the three circles (around the original momentum marks, incident sphere and target sphere marks) to Point Zero. We added the vectors of the incident sphere and target sphere momentums to get the total momentum after collision. Then we (or some of us) repeated everything (besides finding out the Original Momentum) all over again after we relocated the set-screw to a different spot. Lastly, we answered a few questions in the Interpretation section at the end of the second page. Oh.. and everything was done under the observing-eyes of three guys from Germany, Australia and University of Winnipeg, I thinkkkk it was. They observed and helped us with our lab, for example; giving us nickles and dimes to trace perfect circles. That was everything I (surprisingly) remembered. If I missed anything, I'm sorry (not), but I tried hard to recall what happened.

&&the next scribe post was already chosen, evidently. cuz he posted his before mine! haha

p.s. we might've had a hand-out at the end of class????? no clue

Momentum Continued

Today in class we went over the the Chapter 9 Study Guide Section 9.2: The Conservation of Momentum. Here is an example from the sheet:

Two balls of unequal mass traveling at different speeds collide head-on and rebound in opposite directions.
Q: How does the force that ball A exerts on ball B compare to the force that ball B exerts on ball A?
A: equal but opposite

Ms. K also mentioned having multiple choice on the exam, or something similiar, I can't really remember. She also gave us an assignment called Impulse and Momemtum which we will probably go over tomorrow. The rest of the class was just to finish up the labs and work but apparently Chris had all the work from our group and we couldn't finish it. Well that pretty much sums it all up. The next scribe will Andrew! If anybody is reading this, have a good night.

Momentum

Today in class we were assigned to make a catapult that will sucessfully launch a tennis ball twenty meters and it is due October 22, 2007. We also went over the answers to the Chapter 9 Study Guide, 9.1 Impulse and Change in Momentum. We also have to read Chapter 8 pages 276-301 and told to look at the key terms: momentum, impulse, F vs T graphs, conservation law and glancing collisions. We have a lab tomorrow. Do stapled Chapter 9 Study Guide.


We have three people coming in to our class to observe us. From Deutschland, The Outback and The University of spirit.

The next scribe is Bryan.

Momentum Lab

Hey everybody!

Today in class we started our first lab for the new unit Momentum that involved the collisions of two carts. We had to record the distance the carts traveled, the time they traveled, and the mass for each cart. We were given a question sheet for the lab that we were to complete for tomorrow. Ms. K also gave us two works to do for homework; Chapter 9 Study Guide and Chapter 7 : Momentum. So those who have missed school today should get them tomorrow.

The next scribe will be ... Sergio

Momentum

Hello everyone!




Today Ms. K handed our labs and tests back. I think that most people in the class did better on this test than the previous test. If you didn't get the answers for the test, Ms. K has posted them up on the blog.





After going over the test, we were given the chapter 9 study guide. We went over the first paragraph, momentum and impulse.





something to remember:


The impulse given to an object is equal to the change in the object's momentum.

Well that's all we did today. We will have a lab tomorrow.


If you want to visit that site Ms. K was on, here it is:

http://www.walter-fendt.de/ph11e/collision.htm

The next scribe is Jessicca I.