Physics Animations

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Olber’s Paradox in Action

From Wikipedia: Also called the “dark night sky paradox” it argues that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. The darkness of the night sky is one of the pieces of evidence for a dynamic universe such as the Big Bang Model. If the universe is static, homogeneous at a large scale, and populated by an infinite number of stars, any sight line from Earth must end at the (very bright) surface of a star, so the night sky should be completely bright. This contradicts the observed darkness of the night.

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The Carina Nebula expanding as seen by the Hubble Space Telescope.

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Image 2Venturi

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This is a side view of an airplane wing. Notice the shape.  This is called an “airfoil”.  An airfoil is any curved surface that gives a favorable ratio of lift to drag while in flight.  Follow the air molecules above the airfoil vs. below the airfoil.  Notice how they move faster over the top. Faster airflow has a lower pressure than slower airflow.  We discussed the reason for this in class.

 

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Another example of the air above an airfoil moving faster than the air below the airfoil.

 

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cycloid pattern

 

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Forces, inertia, acceleration = Physics!   You really don’t stand a chance in a wreck.  This is why you wear a seatbelt in a car.  These boaters were shaken up, but no permanent damage.  Driver was going waaaaay to fast.  Girls were NOT impressed.

 

GravityWaves

Gravitational waves alternately stretch and squeeze space-time both vertically and horizontally as they propogate. For more information click here

 

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Gravity waves formed when two black holes orbit each other.  On Feb 11th, 2016 it was announced that Gravity Waves have been confirmed (to a 5 sigma accuracy). Dr. Einstein was correct again!  It only took physicist 100 years to confirm.   LIGO finally came through.

 

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Conservation of Angular Momentum.  As she brings her arms in she spins faster. When a massive star implodes it does the same thing. Its rate of rotation goes from, say, 2 km/sec to 2000 km/sec.

 

 

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From Earth to Uranus in 3 seconds.

 

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Taken from Nasa’s new Deep Space Climate Observatory as the moon passes between it and the earth. (from Nasa’s website). No, it’s not a fake.

 

High speed golf ball impact

This around 1000 frames per second. We see at around 24 frames a second. Notice that the golf ball suffers from A LOT of internal forces during (and the microsecond after) collision. All of this results in a big loss in kinetic energy.  Therefore, no macroscopic collision is perfectly elastic. There is always some energy lost in the collision.  We simplify situations in early physics classes so that we can get the general concept.  The truth is MUCH more interesting, but unfortunately, much more difficult in a math sense.

 

 

 

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A neutron (up quark and two down quarks) spontaneously transforming into a proton (two up quarks and a down quark).  Time in the vertical axis. Space is the horizontal axis. The neutron gives off an electron ( a beta particle in this case) and a antineutrino through the W boson force carrier.  The whole process is over and done with in less than a femtosecond.

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Good example of recoil version of conservation of momentum.  He should have not locked his elbows.

 

 

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Poor hamster is a victim of conservation of momentum (elastic collision in this case).  We’ll assume she caught the little guy.

 

 

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Good example of Newton’s First Law:  An object at rest will remain at reast and an object in motion will remain in motion with a constant velocity (speed AND direction) unless acted upon by an unbalanced force.

 

 

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A good example of Conservation of Angular Momentum.  If the cat is going to walk counterclockwise, the chair HAS to move clockwise to keep the system’s Angular Momentum from changing.

 

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Announcing the Fall 2015 Physics Hall of Famers:

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This animation shows that it doesn’t matter what order you add vectors in the Head-to-Tail method . . . the resultant is still the same.

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  Definition of a radian:

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Screenshot 2015-12-06 12.47.46

Click here for:  Hall of Fames — 2015

Click here to go to AP Physics C (Mechanics and E&M)

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Since we are talking about Mach Numbers:

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Physics of sliding down a curved slide when initial velocity is too high.

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8 Earth years are roughly equal to 13 Venus years, meaning the two planets approximately trace out this pattern with 5-fold symmetry as they orbit.

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The best way to learn is to practice:

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We live in a world that requires non-Euclidean geometry. Image 4Painful Newton’s 3rd Law:Image 3

Water on Europa (a moon of Jupiter) vs. water on the Earth. Looks like Europa will be very important to humans in the next couple hundred years.

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Just passing through.  Is there a difference between the friction on his knees vs. the friction on his face?

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Thrust, Center of Mass, Center of Pressure, Torque, Angular Momentum and in two disastrous seconds. Korean Rocket

This cat can use a bit more Meow sub s.   :  )

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Gyroscope_precession

We talked about the Earth precessing like a gyroscope. There is more about this in the screen shots from 11/17-11/21.

An amateur astronomer caught this accidentally in 2012. Jupiter captures another potential earth destroying asteroid that no one even knew was out there.  That visible plume from the asteroid exploding in Jupiter’s atmosphere is about the size of the Earth.   Jupiter is my best friend (sorry Randy). Image 2

A 3D projection of an 8-cell performing a 

double rotation about two orthogonal planes

(As in the Black hole in Interstellar)

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Below is the complicated 10 year path of the Rosetta Probe as it traveled to the Comet.

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Newton’s burst of colorful inspiration:

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Circular motion converted to Simple Harmonic Motion

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Check out the pictures below. Scroll over the picture to show the hour and year:

Recent Posts

5/2-5/6/16 (Pulleys,Machines,Work,ConofE,Power)

HO (3 sided)  120pt TEST8 THT

color code:

ORANGE:  Homework Assignment

RED: Assignment due

GREEN:  Something going on at lunch

PURPLE:  Something going on at night

BLUE:  a link to what we watched

WHAT  HAPPENED LAST WEEK:

Mon (4/25) —  PACKET 8 BEGINS! 

  • BOW
  • JOKE MONDAY
  • HO Sheet 8.1 and worked on it.

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Tues (4/26) —

  • Stamp for 8.1
  • HO Sheet 8.2 and went through a Villatoro Short Cut.
  • Introduced the Lab / Contest from the front of 8.1

TUESDAY AT LUNCH (12:12-12:55):   ROCKETRY 

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Wed (4/27)—

  • Basically worked on the 8.1 lab all hour

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Thur(4/28) —

  • CALL FOR 8.2
  • HO 8.3 –> START THE CONCEPT OF “WORK”!!
  • Simple Pulley systems
  • Intro to Machines

THURSDAY AT LUNCH (12:12-12:55):   THREE ASTRONOMY  GUEST SPEAKERS

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WHAT IS HAPPENING THIS WEEK:

Mon (5/2) —  

  • BOW
  • JOKE MONDAY
  • SLIDE SHOW
  • Some classes need to catch up with Machines and Pulleys, others need to catch up with Work.
  • Start the Work Activities

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Tues (5/3) —

  • continue with “work” activities
  • continue discussing work
  • HO Sheet 8.4  Work problems

TUESDAY AT LUNCH FINAL ROCKETRY MEETING?  PAINTING, PIZZA-CHIPS- POP 

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Wed (5/4)—

  • Finish up work problems

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Thur(5/5) —

  • Finish up 8.3 and 8.4

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Fri (5/6)—

  • Call for Sheet 8.4
  • Go to the stadium to run steps (bring the right shoes and clothes)

FRIDAY AT LUNCH  Physicist and Actor Dr. Thurston will talk about the nuclear physics of stars

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WHAT IS HAPPENING NEXT WEEK:

Mon (5/9) —  

  • BOW
  • Joke Monday
  • Slide Show

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Tues (5/10) —

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Wed (5/11)—

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Thur(5/12) — HO 4 sides of  the TEST 8 / FNL THT

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Fri (5/13)— 15th ANNUAL PHYSICS PICNIC! 

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PICS FROM LAST WEEK:

 

  1. 4/25-4/28/16 (Pulleys/Inclines/Work) Leave a reply
  2. 4/18-4/22/16 (Test Week!) Leave a reply
  3. 4/11 – 4/15/16 (Force at Angles) Leave a reply
  4. 4/4 -4/8/16 (Impulse,Angles) Comments Off on 4/4 -4/8/16 (Impulse,Angles)
  5. 3/28 – 4/1/16 (FBD&ANGLES,Gravity) Comments Off on 3/28 – 4/1/16 (FBD&ANGLES,Gravity)
  6. 3/21 – 3/25 (FBDs, Angles, Center of Mass, Barycenters) Comments Off on 3/21 – 3/25 (FBDs, Angles, Center of Mass, Barycenters)
  7. 2/29 – 3/4 (FBD, Newton’s Laws) Comments Off on 2/29 – 3/4 (FBD, Newton’s Laws)
  8. Pics from 2/22-2/26/16 (FBD’s, Lift) Comments Off on Pics from 2/22-2/26/16 (FBD’s, Lift)
  9. Pics from 2/15-2/19/16 (Newton’s 2nd, FBDs) Comments Off on Pics from 2/15-2/19/16 (Newton’s 2nd, FBDs)