Waves in One Dimension

In today's class, Mr. Vincent started teaching us about waves as it will be our new unit. He handed out papers that explained everything about waves and went through it all with us. We learnt that a wave is a disturbance that transfers energy from one place to another. One of the waves we learnt today is called a transverse (periodic) wave - produced by a disturbance that is moving back and forth continuously. The other wave is called a longitudinal (compressional) wave - the vibration of particles that travel the same direction as the motion of the wave. Waves have a pulse which is a single wave bump, they have crests which are the high points on a wave, troughs are the low points of a wave, and the amplitude of a wave is the maximum height between the top of a crest or bottom of the trough to the middle (particle's undisturbed position). Each wave also has a frequency - how many complete cycles (or crests) past a point per unit of time - which is measured in hertz (Hz), and a wavelength - distance from one crest to another or one trough to another. A period in a wave is the time elapsed between two successive crests passing by the same point in space and a cycle is how many times the particle does a complete oscillation (particle moving up & down or left to right) once.

Mr. Vincent then gave us a worksheet that helped us "describe waves" - learn the wave basics. We did questions 1-5 on the worksheet. We are doing a lab in tomorrow's class. & one last thing PAR will be the next to scribe :) hope this was a good scribe for my first time :) bye!

Last person to scribe this session is Paula!

March 9, '11 - Dynamics - Vectors

Today we started off by correcting the lilac coloured sheet "Grade 11 Physics: Dynamics-Vectors". Remember that you have to include the direction or unit in the answer or you'll lose marks. Then we went over the backside of the page, and the practice questions are for homework and we'll go over them tomorrow.
1. A boat aims itself due east at 15km/h across a northern current of 5.0km/h. What is the boat's resulting velocity?
2. What is a ball's actual velocity if after 2 seconds in the air, it has a Vy = 20m/s up and Vx = 10m/s?
3. What is a kite surfer's velocity if the waves are moving him East at 1.5m/s and the wind is blowing him North at 4m/s?

After we corrected questions 1-5 on Newton's Second Law (page 43) of the Dynamics booklet, and if you haven't finished questions 6-9 have them done for tomorrow. Then Ms K assigned pages 12 (Net Force) and 33 (Transparency 4-4 Weight and Normal Force) in the Dynamics booklet to be done for tomorrow as well.

If you need a protractor you can buy one from Ms K for $1. And don't forget the test on Friday!
BryanC to scribe next

Tuesday, March 8, 2011.

Salutations.

In today's wonderful class we went over our assigned homework pages in our Dynamics booklets. We went over the answers of page 31, "Transparency 4-2 Worksheet" and how it was done. Don't forget to convert what you're given (km/h to m/s, and hours to seconds) to fully answer what the question asks for. Unfortunately I left to go to the washroom at the end of this page, and came back when we had to work on the new sheets. If someone would please enlighten me on what went on during my absence and leave it in the comments below for everyone to view, that would be greatly appreciated.

Continuing on with the second half of class, we were given two sheets labeled "Dynamics-Vectors" which was for practice, and "Forces in Two Dimensions" which was to be handed in. We were to plot the vector of the plane's velocity on the graph provided.

• The questions asks that you first decide on a scale, in which case [1cm = 10m/s] was recommended. Also label the directions (north, south, etc.) but I bet you already knew that.
• The next step would be to take your protractor, starting at the origin, and place a line 30 degrees to the north of east direction.
• If you did this correctly to the scale recommended, you will have a 6cm line (because the velocity is 60 m/s) with an arrow at the end because it is a vector. Place your protractor on top to make sure it is aligned with the 30 degree mark.
• Next you were to add another vector, representing the velocity of the wind that "blows on the airplane with a speed of 8m/s going in the direction 75 degrees south of west in the same way." Again, line it up with your protractor to make sure it is accurate.
• The resultant line would be the line connecting the origin to the head of the wind vector.
• The last part was to answer the few questions on the back, which deals with the beautiful diagram you just created.

I assume this should be finished by tomorrow's class. A reminder to bring your own protractor to avoid the unlikely event of having to buy one as I did. If there's anything I missed, comment below!

Don't forget the test on Friday! Have a wonderful evening, the next scribe shall be justing.

DYNAMICS in miss k's class

well today in physics we had to hand in our lab graph which we did on friday plus we have a dynamics test friday so remember to study! today mrs.k forced us to work in our dynamic booklets on page 30 31 and 43 .since im such a nice guy ill post our force notes up here.our precious notes included Fa:friction between snow and sled
Fb:pull of person on sled
Fc:tension between sled and rope
Fd:pull of rope by person
Fe:pull of sled by person
Fd:friction between person and ground
oh yea the pages that should be completed for tomorrow are 30 31 and 43
and before i forget mrs.k wants us to bring a protractor to class tomorrow due to a assignment shes assigning us to do.

i proclaim the next scribe to be bobthebuildeder
lets see if he can fix it. =D

Friday, March 4th 2011

Last Friday, in the beginning of our physics class, we received our movie assignment back (the one called Newton's 1st Law by Paul Hewitt, where we had to write down seven physics facts that we liked.). Then we went over the free body diagrams in our book, we finished the questions on page 41 and 42 (note: Static means not moving, and if a ball is on an incline slope the normal force exerted from the surface the ball is on, would be perpindicular to the incline). Then we finished up the lab, and it may be handed in by next Monday. Keep up the good work!

The next scribe for next class would be the one and only ahmed rage!

March 3, 2011 - Force and Acceleration Lab

For today's class, we started off by doing the lab or experiment about force and acceleration. As we have learned yesterday from the video by Paul Hewitt about Newton's first law of motion, which states that "when no net external force is acting on an object it will either remain at rest or, if it is moving, it will continue to move in a straight line at constant velocity". We will have to apply what we've learned from recent lessons for this lab.

We started the lab by preparing the equipments needed such as laboratory cart, recording timer, carbon paper discs, pulley, large paper clip, washers, and heavy strings. After that we follow the procedures in the lab handout(if you don't have one, please ask Ms. K for a copy). Make a data table, record your results, sketch a graph for your results and I think we have to answer the Interpretation in the worksheet. Don't worry, Ms. K told us that we still have some class time to finish the lab for tomorrow.

Definition:

Tock - is the distance between two consecutive numbered dots represents one time interval.

Things to remember:

          1. Test the sys. to see if you have offset friction. (Hint: put enough washers on big paperclip to offset friction)

          2. Label 5 tapes as 50g, 100g, 150g, 200g and 250g. Tapes should measure 1.0 metre long.

          3.Data table 7 - 1 needs to be extend(1-16) for tape 1 and 2. This means you need more than 10 entries for 2 tapes.

I think that's all, the one who will scribe for tomorrow's class is Keinaan94.

Newton's 1st Law - Paul Hewitt and Free-Body Diagram for objects on an Inclined Surface.

Definition: For Today Class!

Newton First Law: The law that a particle not subjected to external forces remains at rest or moves with constant speed in a straight line.

Force: Push or Pull.

Inertia: The ability of an object to resist changes in its state of motion is a fundamental property of all matter

Weight: The force that gravity exerts on an object due to its mass [SI unit is the Newton]

Mass: the quantity of matter an object contains [SI unit is the kilogram]

Gravitational force: is an attraction between two objects because of their mass

Friction: A force opposing the relative motion of two objects that are in contact.

We started the class by watching video, the video that Mrs. K wants to show us last week. The title of the video is Newton’s 1^st law by Paul Hewitt. Our task for the class today is to understand the video and Write down 7 interesting that you learned in the video. The summary of the video are about Inertia, force, gravitational force, mass, weight, velocity, and acceleration. Also, from the video they talk about the homework last week on the book Pg.37 # 1. After we done watching video we continue to talk about the free –body diagram for objects on an inclined surface (page 17 # 7 & 8).

Mrs.K wants us to answer the FF.

Page 40 (#8,9,10) the one that we skipped last Monday because we did not study the object on an inclined surface.

Page 41 (#1-8)

Page 42 (#9&10)

Lastly Mrs. K said that be prepare for our First lab tomorrow. Read the worksheet that she gave to us (Force and Acceleration).

Have A Nice Evening Everyone :)

Next Scribe : Da5rkmatter