Askey Physics

All things Physicsy

3/2 – 3/6/15 (Center of Mass; Newton’s Laws; Torque Introduced)

Posted on March 8, 2015 by daskey

THIS WEEK (TEST WEEK):

Mon (3/9) — TRIBE DAY FOR THT

Tues (3/10) — RED DAY; Special Guest Speaker — The Physics of Fighting ISIS

Wed (3/11) — 456 points in one day!! 200ptTEST 7, 100pt Notebook, 120pt Packet 7, 36pt Packet 7 Divison Check

Thur (3/12) — FEAST AND FILM!!

Fri (3/13) —Parent Conferences for Enrollment

I WILL ADD CAPTIONS AND MORE PICS LATER TODAY

: Good example of Newton’s 1st Law

: UNbalanced torque causes rotation, just li9ke an unbalanced force causes acceleration.

: Here’s Engine — World’s first steam engine (100AD)

: Here’s what it looked like

: Modern day replica

: Here’s how it worked.

: Torque intro.

: Circular world and linear world are bridged by the radius.

: True in school. True at your work.

: When we do pulleys, we’ll use the idea that the x axis is melted around the pulley

: #1 rule of pulley land: DOM is positive.

: Salvador Dali (1904 – 1989)

: Dali’s melting clocks

: Coffee art

: Internet’s version of Dali’s painting

: Slavador Dali Museum in St. Petersburg, Florida.

: One of my favorite Dali painting

: Melting stairs

: My absolute FAVORITE painting. Do you see the man in the Sombrero?

: If it is a system of particles, you pick a direction of motion.

: You’ve got to know the three laws and the correct order. Trust me. It’s important.

: THis has been around a while, but just in case you have never seen it.

: Cart and steel balls. As balls roll down the ramp it is still one system and the cart moves to maintain the system’s center of mass relative to the table. As each ball rolls off the back end, you now have a Thrust situation with the mass of the ball leaving the cart at a particular exit speed causing the cart to thrust forward similar to how a rocket works.

: Poor Olivia.

: THis how we did it when I was in high school and college.

: Newton’s 3rd Law graphed.

: Center of Mass formula.

: Sample problem involving center of mass.

: Teeter Totter Physics is an alternate way to work some Center of Mass problems.

: Short cut way of writing the Center of Mass (C.M.) formular.

: the ole match burning trick.

: What’s up with his Center of Mass?

: I have this bird.

: Doing the trick to find center of mass.

: Finding the Center of Mass of Massachusetts

: Center of Mass formula.

: The formula on top is algebra based. The formula below is the same but Calculus based.

: Gravity only acts on the center of mass of an object. Notice the C.M.’s path is parabolic.

: . . .

: The skater/Board system keeps the same center of mass eventhough he leaves the skate and then falls back on.

: This one is interesting. Notice how the C.M. of the system remain in a parabolic path. The Motorcycle’s path is to the left of the parabola, the rider’s path is the the right.

: . . . .

: . . .

: In Astronomy we call Center of Mass the Barycenter.

: The Barycenter between the Earth and the moon.

: A 1 to 81 ratio

: Remember, C.M. or Barycenter can be thought of as teeter totter physics.

: The earth does not orbit the sun in an elliptical path . . . the Barycenter does.

: Earth’s orbit vs. Barycenter’s orbit.

: Earth vs. barycenter.

: We can use C.M. to solve this physics problem and other Physics problems that you turn into one system.

: . . .

: . . .

: . . .

: Felix Bumgartner. Modern day hero.

: The only other body acting on Felix when he jumped was the Earth. It is the other body. So the Earth is pulling on Felix and Felix is pulling back on the Earth

: Equal and opposite forces.

: Felix at 128,000 ft.

: Heading back home.

: No wind up there.

: What is we all jumped from an airplane at the same time?

: Turns out it would only ccelerate the earth at approximately 1 pm /s/s.

: good to know.

: The three boxes

: Martin has the SECRET to changing the world around us: “Our lives begin to end the day we become silent about things that matter.” Memorize this secret quote and use it to fight for justice . . . and rack in some sweet sweet bonus.

: Box A has no idea box C is up there.

: . . .

: The little girl pulling the wagon at an angle.

: . . .

: We’ll finish this Monday.

: Cool, but about $400

: The end of humanity is near.

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