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PowerPoint - UMD Physics
PowerPoint - UMD Physics

kg m/s 2
kg m/s 2

... line motion (i.e., motion with constant velocity) until acted upon by an unbalanced force • inertia: concept introduced by Galileo – an object’s tendency to resist changes in its motion – mass of an object: a measure of the amount of inertia the object has • an object with a larger mass has more ine ...
81 KB - CSIRO Publishing
81 KB - CSIRO Publishing

Physics 170 Week 9, Lecture 1
Physics 170 Week 9, Lecture 1

... • We will introduce the basic concepts of dynamics of particles in three-dimensional space. • We will review Newton’s three laws of dynamics and the concept of inertial reference frame. • We will formulate Newton’s second law for the dynamics of a particle in Cartesian coordinates. • We will solve a ...
Proficiency Review
Proficiency Review

... A transformer is a device in which alternating current in one coil of wire induces a current in a second coil. Which of the following properties is necessary for a transformer to work? A. When a magnetic field changes an electric current will be induced. B. Magnets are needed for an electrical curre ...
1 - CSUN.edu
1 - CSUN.edu

... 7. Calculate the percent error in table C. 8. Repeat the steps above for table D,E,F. Be sure to keep NET FORCE CONSTANT and increase mass while experimenting to find the answer for question b. You will need to recalculate the kinetic friction every time you add more mass. ...
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Word - Structured Independent Learning

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Chapter 6 Notes - Northern Highlands
Chapter 6 Notes - Northern Highlands

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... education? In recent years, both physicists and mathematicians have asked whether it is possible that space and time are discrete. If we could probe to size scales that were small enough, would we see “atoms” of space, irreducible pieces of volume that cannot be broken into anything smaller? [1]. Qu ...
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Title of PAPER - Department of Physics and Astronomy

... The forces felt as a body accelerates or decelerates can be measured in multiples of Earth’s gravity g. The g force is a descriptive measure of acceleration. ...
AP Physics 1 Exam Cram Sheet
AP Physics 1 Exam Cram Sheet

... 35. If conservative forces are the only forces doing work, mechanical energy is conserved. 36. Work done by conservative forces is path independent. 37. Power is the time rate of change of work or energy, but it can also be calculated using force  speed. 38. spring : pendulum :: spring constant : g ...
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simple harmonic motion - IndiaStudyChannel.com
simple harmonic motion - IndiaStudyChannel.com

...  A pendulum clock runs fast when 1) L decreases and 2) g increases.  Time period of a pendulum clock depends on g where as time period of a spring clock does not depnds on g.  The spring constant of a spring may be defined as the force required to produce an extension of one unit in the spring. k ...
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... A) If mass of the object is known, and all forces acting on the object are known, then the acceleration vector can be calculated. B) If the acceleration vector and mass of an object are known, then the Net Force acting on the object can be calculated. It may surprise you! C) If the acceleration vect ...
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Slide 1

name date - Thomas C. Cario Middle School
name date - Thomas C. Cario Middle School

... 64.) Day and night are caused by? 65.) Tides are caused mainly by? 66.) When compared to the gases around the sun, sunspots are…? _____________ 67.) Which unit of measurement is used for distances from star to star or to another galaxy? 68.) The Milky Way galaxy has which type of shape? 69.) The for ...
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Lecture #1

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p250c04

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Modified Newtonian dynamics



In physics, modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's laws to account for observed properties of galaxies. Created in 1983 by Israeli physicist Mordehai Milgrom, the theory's original motivation was to explain the fact that the velocities of stars in galaxies were observed to be larger than expected based on Newtonian mechanics. Milgrom noted that this discrepancy could be resolved if the gravitational force experienced by a star in the outer regions of a galaxy was proportional to the square of its centripetal acceleration (as opposed to the centripetal acceleration itself, as in Newton's Second Law), or alternatively if gravitational force came to vary inversely with radius (as opposed to the inverse square of the radius, as in Newton's Law of Gravity). In MOND, violation of Newton's Laws occurs at extremely small accelerations, characteristic of galaxies yet far below anything typically encountered in the Solar System or on Earth.MOND is an example of a class of theories known as modified gravity, and is an alternative to the hypothesis that the dynamics of galaxies are determined by massive, invisible dark matter halos. Since Milgrom's original proposal, MOND has successfully predicted a variety of galactic phenomena that are difficult to understand from a dark matter perspective. However, MOND and its generalisations do not adequately account for observed properties of galaxy clusters, and no satisfactory cosmological model has been constructed from the theory.
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