Tuesday, December 10, 2013
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Transcript of Tuesday, December 10, 2013
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Tuesday, December 10, 2013
By the end of the day today, IWBAT…• Calculate momentum and explain the relationship between momentum, mass, and velocity
Do Now: An ice skater applies a horizontal force to a 20 kg block on frictionless, level ice, causing the block to accelerate uniformly at 1.4 m/s2 to the right. Determine the magnitude of the normal force acting on the block.
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Why it matters in THIS CLASS: Unit #7 Content approximately ½ of your upcoming Final Exam
By the end of the day today, IWBAT…• Calculate momentum and explain the relationship between momentum, mass, and velocityWhy it matters in
LIFE:“Momentum” is a term you hear a lot in every day life (i.e. sports, political/social movements, etc) but now let’s make the connection to physics
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What it might look like on a test:
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Agenda + Announcements
Do Now 5 mins
Agenda 3 mins
Momentum C-Notes 15 mins
Work it Out 10 minsRube Goldberg
Planning 17 mins
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10 days!!!!!!!
I am so proud of all my hardworking physics students! You are almost to the end of your the fall semester!
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The Plan09
Intro to Momentum
10
Momentum vs. Impulse
11
Conservation of Momentum
12
Momentum Lab
13
Rube Goldberg Devices Due In Class TODAY
16
Last Day for Full Review in all Classes
17
FINALSP. 03 & 04
18
FINALSP. 05 & 06
19
FINALSP. 01 & 02
20
FINALSP. 07 & 08
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Proud & Courageous Eagles
Honesty & Respect:Students are given all
necessary tools to do well on physics exams.
Our BEST Eagles prepare their own materials and complete
work with their groups, rather than blindly copy someone
else’s work.
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Proud & Courageous Eagles
Self-Control:Control of one’s emotions, desires, or actions by one’s
own will.Academic Integrity is an
important factor in individual growth.
Students that cheat reduce their ability to learn &
sabotage their growth!
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• The Unit 7 Cover Sheet goes into your journals to keep track of
your completed daily work prior to the exam. Record all
assignments and keep it together.
Unit 7: Momentum & Impulse
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Monday, 12/09/13TEKS:
P.6C: Calculate the mechanical energy of,
power generated within, impulse applied to, and momentum of
a physical system
By the end of today, IWBAT…
Define and calculate
momentumEssential Question:
What is momentum?
Topic:Momentum
Information for your CNotes
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Momentum Momentum = Mass in motion Any object that is moving has
momentum
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vs
Demo
Which is harder to stop?
Which is harder to stop?
fast
slow
Click on this link to learn more about the physics of bowling
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What is the equation for momentum?
Momentum depends on the mass of the object and the velocity at which its traveling
Momentum is DIRECTLY proportional to mass and velocity. (if mass , momentum , if velocity , momentum )
Momentum = mass x velocityp = m x v
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What are the units for momentum? p = m x v
Momentum = mass x velocity
kg∙m/s = kg x m/s
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What are the units for momentum? Units = kgm/s
Measurement UnitDistance Meters (m)Time Seconds (s)Velocity m/sAcceleration m/s2
Force Newton (N)Momentum kgm/s
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Think, Pair, Share
OR
WHICH HAS MORE
MOMENTUM?
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What if I tell you…. Mass of the bullet = 0.045 kg Velocity of bullet = 3000 m/s
Mass of elephant= 1250 kg Velocity of elephant= 0.108 m/s
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And the winner is….p = mv
pbullet = (.045 kg)(3000m/s) = 135 kg∙m/s
pelephant = (1250 kg)(.108 m/s) = 135 kg∙m/s
EQUAL!!
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Work it OutDetermine the momentum of … 60-kg halfback moving at 9 m/s 1000-kg car moving at 20 m/s. 40-kg freshman moving at 2 m/s.
A bicycle has a momentum of 24 kgm/s. What momentum would the bicycle have if it had …
twice the mass and was moving at the same speed? the same mass and was moving with twice the speed? one-half the mass and was moving with twice the speed? three times the mass and was moving with one-half the
speed? three times the mass and was moving with twice the speed?
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Rube Goldberg Project Plans
Begin working on your device. You will present your functional device during class on Friday, December 13th.
Formulate a solid plan using the instructional guide and resources on the project webpage (found under the ‘Work & Energy’ tab).
You must be both creative and logical, initiating a manageable plan to build the device using materials you can easily acquire for construction during this week. The most effective devices are constructed, tested, manipulated and retested well in advance of the due dates to ensure functionality.
Submit the first phase of design plans with your partners. Keep YOUR OWN INDIVIDUAL COPIES, turn in ONE planning sheet that includes: Group name and members Materials you will use (a minimum of 6 segments with
transitions) Rudimentary schematics (*see example template)
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Exit Ticket Upon what two things does momentum
depend?
What letter represents momentum?
If mass and velocity double, what will happen to an object’s momentum?