DAY 63
#Goals: SWBAT...
1. Define Impulse
2. Describe how momentum is transferred during a collision.
3. Measure in SI the momenta involved
4. Interpret Data from a collision.
5. Draw Conclusions that support the law of conservation of momentum.
WARM-UP & HW Check:
A. When you jump from a height to the ground, you let your legs bend at the knees as your feet hit the floor. Explain why you do this in terms of the physics concepts introduced in this chapter?
B. What is the formula for Newton's Second Law?
C. What is the meaning of Δv? What about Δt? Δp?
CLASSWORK:
1. Take out a half-sheet of paper. Prepare for the reading/watching quiz. It's happening now... :-)
2. Impulse Notes:
What does it look like when a force is applied to an object?
http://scienceblogs.com/startswithabang/2012/09/15/weekend-diversion-the-physics-of-happy-gilmore/
https://www.asme.org/engineering-topics/articles/applied-mechanics/engineering-our-favorite-pastime
ADD THE NEXT 4 LINES TO YOUR Equation Chart
Formula: FΔt=Δp
Def: product of the average force and the time interval of the collision.
Units: Newton-seconds
Symbol: none
So, what is impulse, and why is it important? Well, you should know from watching the videos for HW...
Let us find out... (start at 7:17 --> http://www.flippingphysics.com/helmet.html )
Video: https://www.youtube.com/watch?v=ph48Xwj_eS8
Pause at 6:15 and try the problem from the video
(Impulse-Momentum Theorem) Notes: Here's where this equation comes from...
F=ma
F=mΔv/t
F-t=mΔv
3. Exam Time. 15-30 min, depending on how well you all focus during the Impulse section of the lesson
4. Momentum Lab
http://www.glencoe.com/sec/science/internet_lab/olc.php?olcChapter=809
Your Final Product:
- Word Document with:
A. Answers to each question from: Analyze, Conclude & Apply; Going Further; Real-World Physics secitions
B. Completed data table.
- fill this out on the webpage. Then use ctrl-printscreen to take a screen shot, and ctrl-v to paste the
tables on your Word document.
HOMEWORK:
1. Complete #1 & #2 from pg 233
#Goals: SWBAT...
1. Calculate Impulse & Force
2. Calculate change in momentum
3. Collect and Interpret velcity-time Data from a collision involving two carts
4. Compare system momentum before and after collisions
5. Calculate kinetic energy before and after collisions
6. Complete a professional lab report
WARM-UP & HW Check:
Solve problem #61 on pg 251
Reminder: Today I'll be checking warm-ups for this week and last week.
(Complete #5 from pg 233; and #9-11 on pg 235; Complete pg 250-252 problems: 47; 48; 58; 69)
CLASSWORK:
1. HW Review
2. Momentum and Collisions Lab:
Your Final Product:
- Word Document with:
A. Answers to each question
B. Completed data table. (You can use the data table from your lab handout for this)
C. Calculations showing how you found the velocity and momentum for part 1, part 2, and part 3
D. Data due Friday at beginning of class. Lab Reports will be written in in class. You'll have 45 min to complete your write-up.
Lab Report Contents & Grading
2pts 1. Introduction: in 2-4 sentences, describe how momentum and collisions are related
2pts 2. Objectives: (given on the lab handout - you can just re-type them)
5pts 3. Data table
10pts 4. Calculations (show your work for one trial from each part)
15pts 5. Evaluation: Write your answers to each question from Part 1, 2, and 3.
Notes: For Part 1, #3, and Part 2, #2, you can calculate the kinetic energy (before and after) for
one trial
Tutoring available after school Mon, Tues, and Wed until 4:30. Lunch almost every day.
HOMEWORK:
1. Have a fun break
2. Don't die or go to jail #goals
3. Come back ready to pump some mental iron and conserve some energy :)