Kinematics+and+1-D+Motion

=**SEPTEMBER 16- Tasha**= Topic: Graphs Text Reference: Page 24 to 32 Idea: Information found in the graphs

~Slope of a d-t graph is the velocity of the object- a slope of 0 is not moving, a slope greater or less than 0 indicates acceleration. ~Slopes of tangents can be used to find the velocity at a specific point. ~Check out this video for a lesson---> []
 * __Distance vs. Time Graphs__**

~Area under a v-t graph is the distance an object has traveled ~Slope of a v-t graph is the acceleration of the object - a slope of 0 is uniform motion, a slope greater or less then 0 tells you the acceleration of the object. ~Check out this video for a lesson---> [] There are 3 parts, all about 3 minutes long!
 * __Velocity vs. Time Graphs__**

~This video explains how to turn a d-t graph to a v-t graph---> []

**SEPTEMBER 19 - Celton**
Topic: Kinematics Grade 11 review Text Reference: Page 10 - 12 (Good flow chart on page 12) Idea: Using the big 5 kinematics equations

Kinematics problems can be generally be solved using one of these equations:

PLUS d= v2*t - .5*a*(t^2)

When using these equations, we go by the following standard: The reference point = initial position The reference direction = initial direction The reference time frame = t0 By using this standard, we can omit the delta symbol in our equations, making life easier.

The proper form for solving an problem goes something like this: 1. Define reference point and direction. You can include a diagram such as: + --> [E] Which refers to that east is the positive direction. 2. State your known (given) variables. 3. State the variables you want to know. 4. State the equation you are going to use. 5. Evaluate. 6. Conclude, remember units **and direction if value is a vector!** Calculations need not show direction in forms other then (+) and (-), such as cardinal or polar directions. These must be included in #2 when you state your variables, and your conclusion!

Handbacks: Significant digits assignment Homework: Finish assign Graph Analysis Assignment (due Wednesday) + Study for Sigfig test (Tuesday)

**SEPTEMBER 20 - Brittany**
Today in class we did a quiz and watched a movie about the "power of ten" which was posted on the wiki by Maria. Don't forget to get a picture/explanation about the exhibit for our review of g.11 physics :) AND MAKE SURE YOUR ASSIGNMENT IS FINISHED!

**SEPTEMBER 21 - Monette**
Topic: Kinematics review Text Reference: Page 20 (Example 10) Idea: Applying the kinematics equations to situaitons

Today in class we solved a word problem involving kinematic equations similar to Example 10 on page 20 of the physics text book. No new assignments were given.

=**SEPTEMBER 23 - Tasha**= Topic: Kinematics Idea: Dual Body Problems

EXAMPLE:

Object A is moving at an initial speed of 10m/s with an acceleration of 1m/s^2. Object B is initially at rest and starts moving with an acceleration of 2m/s^2.

From this you know that da=10t+0.5t^2 and that db=t^2. You also know that da=db+50, so you can find the time that the objects meet: da=db+50 10t+0.5t^2=t^2+50 t^2-0.5t^2-10t+50=0 t^2-20+100=0 (t-10)^2=0 t=10

We also started our egg balancing today, this person is crazy! :P []

**SEPTEMBER 26 - Celton**
Topic: Uniform acceleration (cont) Text Reference: For uniform acceleration practice, refer to handout. Idea: Practice uniform acceleration problems and intro to CGPS!

1. We received our graphing assignment back and did a review of d-t graphs. Here are all the different types of d-t graphs, all of which were reviewed. We also discussed what two-body diagrams might look like on a d-t graph. The complete graph may look like any combinations of the curves above, but remember to fit your graph to reality. If two bodies collide/ stop when the meet, don't continue the curve afterwards, as there is no further displacement, even though mathematically and theoretically there is. For the purposes of the assignment (due Wednesday) draw the full curve, but only use solid for the actual motion, and dotted lines for the continued theoretical motion. Another example where this could occur is when an object is slowing down (accelerating in the opposite direction of its velocity) and comes to a full stop. For our purposes, generally we assume the objects is stopped, even though theoretically it would stop and continue on the direction of acceleration.

2. The second part of class introduced us to CGPS - Cooperative Group Problem Solving. [|Refer here] CGPS continued onto Sept. 27 lesson. We also received more uniform acceleration problems practice handout.

**September 27 - Cheryl**

 * Topic:** Kinematics
 * Idea:** Applying kinematics in the real world; physics really works!

Today we conducted an experiment/challenge with washers and string. Using kinematics equations such as d=vit+1/2at^2, all the groups were able to find the appropriate distances to space the washers on the string, and successfully "clinked" the washers in rhythm as they were dropped. It was both educational and exciting.


 * REMINDER: ASSIGNMENT DUE TOMORROW! FINISH IT!**