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  • HW 78620
    • Stargazers >
      • Next Night Observation Notes >
        • March 3, 2023 Notes
        • March 10, 2023 Notes
        • March 17, 2023 to be added
      • Frequently Asked Questions >
        • How do you set up your night sky observation sessions?
        • Explain why there are four sunrises/sunsets?
        • What are the fundamental motions of the night sky?
        • Explain magnitude of night sky objects?
        • What is a constellation?
        • Star Enlightenment
        • Moon Enlightenment
        • Have you ever gone into space, Mr. Konichek?
        • Do you have some Earth orbiting the sun stories?
        • Woman's image on Moon?
      • Aniruddh Nayak's Photos
      • Paul's 12" Telescope Photos
      • Kinesthetics >
        • Planets PM or AM h-above
        • Earth/Sun & times of day
        • Moon Proof that it spins on axis
        • Earth / Moon perigee & apogee
        • Sun / Earth Seasons, Zodiac Sign
      • Activities - Hands On >
        • Celestial Sphere with fruit
        • Constellation Puzzles - h-above
        • Outdoor solar system walk
        • Bugs Bunny What's Up Doc
        • Stars on Ceiling Kit
        • 13 constellations on the ecliptic?
    • Field Camera Critters >
      • bobcat
      • Porcupine
      • Two different at same time
      • Coyotes
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  • PHYSICS
    • Year Round Physics Pages >
      • Calendars 2013-2014 >
        • Calendars 2012-2013
      • Physics Textbooks Online
      • How to do a Lab Report
      • How to Graph in Excel
      • GNATS >
        • Infinities
    • Vectortines & Astrotines Day Video - Normal Pre-school morning
    • Physics 1st Quarter 2012-2013 >
      • Unit 1 Motion (1st half) >
        • Sept. 3 Welcome & Intro
        • Sept. 4 Bernoulli >
          • 2013-14 videos
        • Sept 5 Intro to Motion
        • Sept. 6 GREAT RACE
        • Sept. 9 Review Great Race
        • Sept. 10 Physics 500
        • Sept. 11 Graph Your Route
        • Sept. 12 Measurement Lab-Day 1
        • Sept. 13 Measurement Lab-Day 2
        • Sept. 16 Sonic Ranger-Day 1
        • Sept. 17 Acceleration
      • Unit 1 Motion (2nd half) >
        • Sept. 18 Sketch-A-Graph
        • Sept. 19 Fab Five
        • Sept. 20 Rocket Lab
        • Sept. 23 Homework Gravity
        • Sept. 24 Law of Falling Bodies
        • Sept. 25 Freefall Terminal Velocity
        • Sept. 26 Parachutes
        • Sept. 27 Parachute Competition
        • Sept. 30 Review
        • Oct. 1 TEST
        • Oct. 2 Review Awards
      • Unit 2 Acceleration (1st half) >
        • Oct. 3 Factors of Acceleration Lab-Day 1
        • Oct. 4 Factors of Acceleration Lab-Day 2
        • Oct. 7 Donatello, B & B Lab, Prob.
        • Oct. 8 Who Pushed That Speeding Truck? Lab
        • Oct. 9 Inertia Homework
        • Oct. 10 Push That Cart Lab
        • Oct. 11 Push That Cart Lab-Day 2
      • Unit 2 Acceleration (2nd half) >
        • Oct. 14 Tablecloth Videos, Inertia
        • Oct. 15 Friction is Fun Lab-Day 1
        • Oct. 16 Friction is Fun Lab-Day 2
        • Oct. 17 Friction Theories
        • Oct. 18 2013 Hovercraft
        • Oct. 18 2012 Hovercraft 1,2,4,5
        • Oct. 18 2012 Hovercraft 5,7,8
        • Oct. 21 Review
        • Oct. 22 TEST
      • Unit 3 >
        • Oct. 23 Infinities (GNATS2)
        • Oct. 24 Page 1 Action-Reaction
        • Oct. 24 Page 2
        • Oct. 25 Action-Reaction
        • Oct. 28 Vectors- Where Am I?
        • Oct. 29 Addition of Vectors Lab-Day 1
        • Oct. 30 Addition of Vectors Lab-Day 2
        • Oct. 31 Vector Homework
        • Nov. 1 Resolution of a Force Lab
    • Physics 2nd Q >
      • Unit 3 Continued >
        • Nov. 4 Plane Application
        • Nov. 5 Ship application
        • Nov. 6 Weight of the World Lab
        • Nov. 7 Parking on a Hill Lab
        • Nov 8 Vector Bowling 2013 >
          • Nov. 8 Vector Bowling 2012
        • Nov. 12 Fundamental Forces
        • Nov. 13 Review
        • Nov. 14 TEST
      • Unit 4 >
        • Nov. 18 Bull's Eye Lab
        • Nov. 19 Projectile Hunter
        • Nov. 21 Trajectory Lab-Day 1
        • Nov. 22 Trajectory Lab-Day 2
        • Nov. 23 Hot Wheels Jump Through the Burning Ring of Fire
        • Nov. 25 Paper Rockets & Make Up Day 1
        • Nov. 26 Launch Day & Make Up Day 2
        • Dec. 2 Review for Unit 4 Test on Proj. Motion
        • Dec. 3 TEST 2D Motion Unit 4
        • Dec. 4 Early Release Day
      • Unit 5 >
        • Dec. 5 Circular & Harmonic Motion
        • Dec. 6 G on an Egg Lab
        • Dec. 9 Gravitation
        • Dec. 10 Zero G???
        • Dec. 11 Airplanes Airplanes Lab
        • Dec. 12 Circular HW
        • Dec. 13 Pendulum Lab
        • Dec. 16 Hooke's Law Lab-Day 1
        • Dec. 17 Mass on a Spring
        • Dec. 18 Review
        • Dec. 19 TEST
        • Dec. 20 Tops & Spinners
      • Unit 6 >
        • Jan. 2 Egg Design and Building
        • Jan. 3 All-American Egg Drop
        • Jan. 6 no school due to cold 2014 but momentum 2013
        • Jan. 6/7 cold day off 2014/Impulse 2014 Impulse-Momentum 2013
        • Jan. 7 cold day off 2014 but Center of Mass 2013
        • Jan. 8 Impulse 2014 but Center of Mass cont. 2013
        • Jan. 9 Stability 2014 but Conservation of Momentum Lab-Day 1 2013
        • Jan. 10 Center of Mass 2014 but Conservation of Momentum Lab-Day 2 2013
        • Jan. 13 Conservation of Momentum 2014 but Review 2013
        • Jan. 14 Conservation of Momentum 2014 TEST 2013
        • Jan. 15 Scavenger Hunt collection 2014 but OMIT Awards 2013
        • Jan. 16 FINALS (Odd hours)
        • Jan. 17 FINALS (Even hours)
    • Physics 3rd Q >
      • Unit 7 >
        • Jan. 22 Walking on Broken Glass Demo (Pressure, Work)
        • Jan. 23 Energy of Collisions
        • Jan. 24 Laying on a Bed of Nails, PE = mgh
        • Jan. 27 Pile Driver Lab
        • Jan. 28 Joules in a Calorie Lab
        • Jan. 29 How Fast Can You Work? Lab
        • Jan. 30 Power Tube Roll-off
        • Jan. 31 Alka-Bomb Testing
        • Feb. 3 Conservation of Energy
        • Feb. 4 Conservation of Energy
        • Feb. 5 Loop the Loop Lab
        • Feb. 6 Conservation Problems
        • Feb. 7 Dart Gun Lab
        • Feb. 10 Finish home work sheet
        • Feb. 11 Ballistic Pendulum
        • Feb. 12 Review
        • Feb. 13 Test - Energy
        • Feb. 14 Infinities
        • Feb. 14 Mt. Aconcagua
      • Unit 8 >
        • Feb. 18 Magnetism
        • Feb. 19 Magnetism
        • Feb. 20 Electromagnetism
        • Feb. 21 It Can't Work Lab
        • Feb. 24 Electrostatics
        • Feb. 25 Charging/Van de Graff
        • Feb. 26 Static uses
        • Feb. 27 Get a Charge Lab
        • Feb. 28 Coulomb/Millikan Oil Drop
        • Mar. 3 Electrophorus/Wimshirst
        • Mar. 4 Lightning
        • Mar. 5 Leyden Jar
        • Mar. 6 Capacitors
        • Mar. 7 Superconductivity >
          • Capt. Jenkins demo's bottom of Mar. 8
        • Mar. 10 Review
        • Mar. 11 TEST
      • Unit 9 Relativity & Waves >
        • Mar. 12 Relativity
        • Mar. 13 Relativity
        • Mar. 14 Relativity
        • Mar. 17 Waves
        • Mar. 18 Slinnnnnnky Interference
        • Mar. 19 Wave Machine
        • Mar. 20 Hot Sounds
        • Mar. 21 Resonance
    • Physics 4th Q >
      • Unit 9 Continued >
        • Mar. 31 Speed of Sound Lab
        • Apr. 1 Sound of Music
        • Apr. 2 Sound of Music
        • Apr. 3 Doppler Polarization
        • Apr. 4 Laser
        • Apr. 7 Holography
        • Apr. 8 Review
        • Apr. 9 TEST
      • Unit 10 Reflection Unit >
        • Apr. 10 TCOB Awards
        • Apr. 11 Reflection
        • Apr. 14 Draw Your Face Lab
        • continue >
          • Apr. 28 Illusions/Review
          • Apr. 28 Review/Illusions Cont.
          • Apr. 29 TEST
          • April 30 Pre-Great America
          • May 1 Physics Great America
          • May 2 Review PGA
        • Apr. 15 Parallax Blue Skies Scattering
        • Apr. 16 Reflection Lab parts 1 &2
        • Apr. 17 Part 3 of Reflection of Light Lab and Magic Cylinder
        • Apr. 21 Light Bulbs/LUX/LM/Blue Moon
        • Apr. 22 Concave Mirrors
        • Apr. 23 Convex Mirrors
        • Apr. 24 Ripple Tank Lab-Day 1
        • Apr. 25 Ripple Tank Lab-Day 2
      • Unit 11 Refraction Unit >
        • May 5 Refraction Unit Day 1
        • May 6 Refraction Effects - The Eye
        • May 7 Refraction Lab Day 1
        • May 8 Refraction Lab Day 2
        • May 9 Ray Diagrams
        • May 12 2 WAY MIRROR & HMWK
        • May 13 Lens Lab
        • May 14 Total Internal Reflection (TIR)
        • May 15 Rainbows/Mirages
        • May 16 3-D & Refraction Effects
        • May 19 Review
        • May 20 Test
        • May 21 Go Over Test
        • May 22 Senior's Last Day
      • Final Stuff >
        • May 23 Rocket Project Physics
        • May 27 Rocket Project Physics
        • May 28 Rocket Project Physics
        • May 29/30 Rocket Project Physics
        • June 2/3/4 Launch!
      • Videos 2011-2012 >
        • Period 1
        • Period 2
        • Vector Bowling
        • Period 4
        • Period 6
        • Period 7
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        • Pole Vault Practice W=KE=PE=Q
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        • period 4
        • period 7
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      • Rocket Launches 6/3/13 >
        • Periods 1,4 pictures 5,7,8
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        • Physics memories...
        • Physics 4th Q 2011-2012 >
          • Unit 8: Electrostatics, Magnetism, and Superconductors
          • Unit 9: Waves, sound, polarization, holograms
          • Unit 10 reflection of light and ripple tank
          • Unit 11 Refraction of Light
    • AP PHYSICS B >
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      • Mechanics >
        • Sept 10 Dimensional Analysis
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      • Chap 13 Simple Harmonic Motion, Waves
      • Chap 15 Electric Forces and Electric Fields
      • Chap 16 Electrical Energy and Capacitance
      • Chap 17 Current and Resistance
      • Chapter 18 DC Circuits
      • Chapter 19 Magnetism
      • Chapter 20.1-20.3 Induced Voltages and Inductance
      • Chapter 27 Quantum Physics
    • AP PHYSICS C >
      • College Credit for AP
      • Princeton Exam 1 Free Response
      • Bull's Eye Lab the AP Way
      • Plover Water System Videos
      • 3rd Q >
        • Jan. 29 - Dot Product, Cross Product, Magnetic Flux
        • Jan. 30 - Faraday's Law
        • Jan. 31 - Motor Demos and CH 20 review
        • Feb. 1 - Practice Mech Exam
        • Feb. 4 - Review Practice Mech #1
        • Feb. 5 - Generators, RL Circuits
        • Feb. 6 - Demos with AP-B
        • Feb. 7 - Chapter 20 Hmwk and Practice Exam Work Day
        • Feb. 8 - Practice Exam Problems
        • Feb. 11 - What is AP Looking For?
        • Feb. 12 - Coulomb's Law
        • Feb. 13 - Short Day
        • Feb. 14 - Practice Problem #3 and 15.4-15.6
        • Feb. 15
        • Feb. 18
    • Physics Sharing >
      • writing references
      • Forces on an Incline Plane
      • Resolution of a Force
  • Astronomy
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      • Mr. Bill Jenkins Transit Day Pictures
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    • 3rd quarter 2014 >
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      • Feb 14th TOSA (Top of South America Expedition) Aconcagua
      • Feb 19th Area of a Sphere -
      • March 3rd Chapter 6 The Earth Lecture
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If you missed today 2012-2013:  We did day 1 of 2 on center of mass and stability.

The center of mass of an object is a point (no width, no length, no thickness; only position) where all the mass of the object can be considered to be.

Our virtue was trustworthiness.
We did a stability demonstration where we had a nail pounded in the center of a uniform density treated short piece of 2X4 with a string plumb bob hanging from the nail.  I also placed sand paper at the base of the 2X4 piece so it would not slide as I tilted a second board it was resting on.   As I lifted one end of the board the 2X4 was resting on the string indicated where the center of mass was in relation to the base and as soon as the string was not over the base the 2X4 fell over.

So an object is stable as long as its center of mass is over its base.

The two ways of making an object more stable is:

    1.  Make the base larger.
    2.  Lower the center of mass so it is closer to the base.

Examples:

1.  Wrestlers will widen their stance to make a bigger base and bend their knees to lower their center of mass in order to be more stable.
2.  I had a small garbage can between the front seats in our van that kept falling over.  I could either lower the center of mass of the garbage can by putting a small plastic bag of sand or rocks at the base OR attach the base to a board that was longer and wider than the base.  I attached the thin board so I wouldn't add more weight to the vehicle so my gas mileage would not get worse.


Hallway Physics

Then we all went out in the hallway and tried these center of mass/stability demonstrations:
1).  with our back against the wall we tried to lean over and touch our toes.  Since our center of mass is just below our naval, as soon as our center of mass was over our toes we fell over....try it.
2).  with either shoulder against the wall and the inside side of our foot against the wall we attempted to raise our outside foot.
3).  facing the wall with our toes against the wall and our nose against the wall, we tried to stand on our toes.


Now since most females carry their more mass in their hips and males carry more mass in the upper body the females center of mass is a little lower than a males and thus females are more stable.  The following two demos the females could do where the males could not do them.

4.  kneel down and place your elbow against your knee with your fingers extended and place an object (we used a white board marker, a pack of gum, a small box of chalk, etc.) upright that distance from your knee.  Then cross both hands behind your back and lean forward to knock over the object with your nose.
5.  place your feet two of your feet away from a wall then lean over a chair or stool with your head resting against the wall and pick up the chair or stool, then stand up.


Other stability tricks that just some students attempted

6.  Stand on your head with your hands down also by squatting down so your knees rest on your elbows and tipping your head to the floor as your knees stay on your elbows and then throw your feet into the air and stand on your head as long as you can.
7.  Face your opponent and step your right feet forward next to each other.  Shake hands and place the other foot where ever you feel most stable.  Now if you get your opponent to move either foot before they get you to move yours you win.  It is a stability game....notice the line your feet our in....just pull your opponent forward perpendicular to the line your feet our in and quickly, when (and if) they push or push your opponent back perpendicular to the line of your feet.

Then we watch a video clip in True Lies where the pelican lands on the hood of a teetering vehicle causing it to fall and then the Myth-Busters version of the same stunt.

Finally we watched as two funnels taped together at their larger opening rolled uphill on two meter sticks.  Actually the center of mass of the two funnels rolled downhill is why it works.
Then we each obtained a meter stick and balanced it at the 50 cm mark on our finger.  Then we set the meter stick on a finger of each hand and moved our fingers together to locate the center of mass.   Then we did the same thing only we just moved our left finger toward our right finger without moving our right finger and we were still able to locate the center of mass of the object.   Then a student took a long metal bar that was much heavier at one end and tried the above showing the center of mass was closer to the heavier end.