I'm out today taking two of the littles to doctor's appointments, plus it's our anniversary :). Hope you all have a good, productive day, and a nice spring break.
When you return, I'll be checking the following from last class (see below), as well as today's classwork. If you're behind on labs, finish over the break, and get that partial credit! :-)
If you're testing this week, please work on the material you missed over the break. I'm happy to help out over the phone/email/remind app if you need it.
While watching the following (http://www.flippingphysics.com/2d-momentum.html) answer/do the following to build your understanding of 2-D problem solving
1. List the given info, and sketch the problem
2. Why does Mr. P show the cardinal directions (compass rose)?
3. How do B, B, and B break the velocity of Disc 1 into components?
4. Write the equations you'll use to solve. Include x and y subscripts if necessary
5. Solve for one component, then the other.
6. Elastic or inelastic? Why?
HOMEWORK
Finish up the answers to Classwork #2 above
Review Example #4 pg 242.
Solve pg 243 #22
Complete any late lab
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04/06/17 WARM-UP: (finish at 12:35)
Watch the video linked below. Answer the questions
1. Take notes for each type of collision: (use the purple format below)
Elastic:
Momentum conserved?
Kinetic energy (energy of motion) conserved?
Examples:
Inelastic:
Momentum conserved?
Kinetic energy (energy of motion) conserved?
Examples:
What is a perfectly inelastic collision?
Examples:
VIDEO LINK: http://www.flippingphysics.com/collisions.html
2. Which ball at 4:50 shows an inelastic collision?
3. Was that a trick question? :-) Which ball was closest to an elastic collision?
CLASSWORK
1. Theory Practice: CH 9 pg 250 38-40 and pg 251 #53 (15 minutes - finish at 12:50)
2. 1-Dimension Calculation Practice: pg 252 #73, 75, and for extra credit #78 (Andrew, this is you!) (finish at 1:10)
Answers:
73: a) vFB = vDT = 0 b) 7.8x102 kg*m/s c) -7.8x102 kg*m/s d) +7.8x102 kg*m/s
e) -7.8x102 kg*m/s f) -6.1m/s
75: -.30m/s
78: 1.26m/s in the same direction
3. HW Review & 2-D Classwork Hints (for problems below) : Video LINK (Finish at 1:15)
4. 2-D Calculation Practice: pg 243: 23 & 24 (finish at 1:45 - clean up - push in chairs please)
HOMEWORK
Whatever you didn't finish. I'll check it the Monday we get back.
#Goals: SWBAT...
1. ... review the basic components of "Work" & "Power"
2. ... solve advanced work and power problems involving forces at diagonal angles
3. ... calculate the power output of a person climbing stairs
WARM-UP:
1. What objects are these kids doing work on as they climb the stairs?
2. A rock climber wears a 7.5kg backpack while scaling a cliff. After 30.0 min, the climber is 8.2 m above the starting point.
A. How much work does the climber do on the backpack?
B. If the climber weighs 645 N, how much work does she do lifting herself and the backpack?
C. What is the average power developed by the climber?
CLASSWORK:
1. Work When the Force Applied Isn't Parallel to the Displacement
A. Example Problem #2 pg 262
B. Complete problems 6, 7, 8
2. Power Lab data collection
3. Warm-Up Check
HOMEWORK:
1. Try this simple work problem: pg 265 #17
2. Bob loads a 100kg oven into a house by pushing it up a 10m frictionless ramp at an angle of 15*. How much work does Bob do?
3. Use a bathroom scale to find your weight in pounds. Convert your weight to kg (look up the conversion), and show your work.
4. Read over the lab on pg 274-275. Expect a reading quiz... :-D