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FizziksGuy

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    Video Discussion: Newton's Laws of Motion in Space: Force, Mass, and Acceleration

    In Video Discussions

    Posted

    Name: Newton's Laws of Motion in Space: Force, Mass, and Acceleration
    Category: Dynamics
    Date Added: 2015-10-07
    Submitter: FizziksGuy

    Uploaded on Apr 18, 2010

    ESA Science - Newton In Space (Part 2): Newton's Second Law of Motion - Force, Mass And Acceleration.

    Newton's laws of motion are three physical laws that form the basis for classical mechanics. They have been expressed in several different ways over nearly three centuries.

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    The laws describe the relationship between the forces acting on a body and the motion of that body. They were first compiled by Sir Isaac Newton in his work "Philosophiæ Naturalis Principia Mathematica", first published on July 5, 1687.

    Newton used them to explain and investigate the motion of many physical objects and systems. For example, in the third volume of the text, Newton showed that these laws of motion, combined with his law of universal gravitation, explained Kepler's laws of planetary motion.

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    Newton's Second Law of Motion: A body will accelerate with acceleration proportional to the force and inversely proportional to the mass.

    Observed from an inertial reference frame, the net force on a particle is equal to the time rate of change of its linear momentum: F = d(mv)/dt. Since by definition the mass of a particle is constant, this law is often stated as, "Force equals mass times acceleration (F = ma): the net force on an object is equal to the mass of the object multiplied by its acceleration."

    History of the second law

    Newton's Latin wording for the second law is: "Lex II: Mutationem motus proportionalem esse vi motrici impressae, et fieri secundum lineam rectam qua vis illa imprimitur."

    This was translated quite closely in Motte's 1729 translation as: "LAW II: The alteration of motion is ever proportional to the motive force impress'd; and is made in the direction of the right line in which that force is impress'd."

    According to modern ideas of how Newton was using his terminology, this is understood, in modern terms, as an equivalent of: "The change of momentum of a body is proportional to the impulse impressed on the body, and happens along the straight line on which that impulse is impressed."

    Motte's 1729 translation of Newton's Latin continued with Newton's commentary on the second law of motion, reading: "If a force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once, or gradually and successively. And this motion (being always directed the same way with the generating force), if the body moved before, is added to or subtracted from the former motion, according as they directly conspire with or are directly contrary to each other; or obliquely joined, when they are oblique, so as to produce a new motion compounded from the determination of both."

    The sense or senses in which Newton used his terminology, and how he understood the second law and intended it to be understood, have been extensively discussed by historians of science, along with the relations between Newton's formulation and modern formulations.



    Newton's Laws of Motion in Space: Force, Mass, and Acceleration

    NEW FILE: LAB: Popper Lab

    In Honors and Regents Physics

    Posted

    LAB: Popper Lab

    View File

    LAB: Popper Lab

    Write up for an open-ended "popper" lab in which students use their kinematic equations to determine the launch velocity of a popper toy.

     

    Popper toys can be found in a variety of places such as Amazon, CVS and Wal-Mart, as well as Oriental Trading.

    CVS Spring Toys item number is SKU# 439412, bar code 50428 06656, "Spring Up & Catch Game", $2.99 each or 2/$5

    Walmart item number is #ES-41035, 6 to a package for $2.98, called the "Sport Pop-Up Game", bar code 79940 41035

    NEW FILE: LAB: How Does a Ball Roll

    In Honors and Regents Physics

    Posted

    LAB: How Does a Ball Roll

    View File

    Students use their knowledge of acceleration and kinematic equations to find the acceleration of two different balls rolling down an incline.  A nice "early lab activity" following introduction of the kinematic equations to get students a hands-on application of their problem-solving principles as well as continued development of general measurement and lab procedures.

    Video Discussion: Einstein's Most Famous Equation

    In Video Discussions

    Posted

    Name: Einstein's Most Famous Equation
    Category: Modern Physics
    Date Added: 2015-09-09
    Submitter: FizziksGuy

    Published on Mar 12, 2015

    In 1905, Einstein published four papers that radically changed how we look at the world around us. Dubbed Einstein’s “Annus Mirabilis,” or “Year of Wonders,” it gave us revolutionary new ideas about light, atoms and how your frame of reference makes a big difference in your perception. 

    But it was Einstein’s final paper that year that really took the cake. In it, he gave us a deceptively simple idea—that mass and energy were equivalent. He even summed it up for us with the tiny equation E=mc^2.

    Video by Chris Smith for Symmetry magazine.



    Einstein's Most Famous Equation

    Book Problem

    In AP Physics 1/2

    Posted

    When you're solving for Vfy, recall that we called down the positive direction.  Therefore, the square root that you want is the positive root (we know the ball is moving down), so vfy=+4.75 m/s, indicating it's moving downward at 4.75 m/s.  (You'll find the rest of the solution on the next page of the book).  Hope that helps!

    Video Discussion: Which AP Physics Course Should I Take?

    In Video Discussions

    Posted

    Name: Which AP Physics Course Should I Take?
    Category: Introductory Concepts
    Date Added: 2015-08-13
    Submitter: FizziksGuy

    This course describes the four different AP Physics courses available from the College Board and which one might best fit your needs. Thanks to Jonathan Thomas-Palmer and Flipping Physics for such a fun collaboration! For more information, please visit FlippingPhysics.com and/or APlusPhysics.com.



    Which AP Physics Course Should I Take?

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