Monday, September 20, 2004
... Free-body diagram: A diagram of vector forces acting on an object A great tool to solve a problem using forces or using dynamics Select a point on an object in the problem Identify all the forces acting only on the selected object Define a reference frame with positive and negative axes specified Dr ...
... Free-body diagram: A diagram of vector forces acting on an object A great tool to solve a problem using forces or using dynamics Select a point on an object in the problem Identify all the forces acting only on the selected object Define a reference frame with positive and negative axes specified Dr ...
The Sun, Stars, and Beyond
... • Irregularly shaped galaxies also exist, though fewer in number. • A galaxy’s shape is determined by its rate of spin, and if it has been subject to any collisions or mergers. • These all contain 100 billion stars or more, and there are 100 billion galaxies out there! ...
... • Irregularly shaped galaxies also exist, though fewer in number. • A galaxy’s shape is determined by its rate of spin, and if it has been subject to any collisions or mergers. • These all contain 100 billion stars or more, and there are 100 billion galaxies out there! ...
BlackBubbles2011
... Now, gravitational force decreases with distance (~ 1/d2) => Starting out high above the surface => lower escape velocity. ...
... Now, gravitational force decreases with distance (~ 1/d2) => Starting out high above the surface => lower escape velocity. ...
Ch. 6 #44+47,45,48,55,58,59,61,71,72,81,85 Ex)87+93 Solutions
... Strategy: The acceleration of the block is zero. Newton’s Second Law in the vertical direction Fy N mg 0 indicates that the normal force equals the weight. Write Newton’s Second Law in the horizontal direction for the block and solve for the coefficient of friction. Let the positive x ...
... Strategy: The acceleration of the block is zero. Newton’s Second Law in the vertical direction Fy N mg 0 indicates that the normal force equals the weight. Write Newton’s Second Law in the horizontal direction for the block and solve for the coefficient of friction. Let the positive x ...
Worksheet
... c) total velocity of the objects d) air resistance between them 7. The force of gravity on an object is known as its _______________. a) acceleration b) mass c) weight d) velocity 8. Air resistance acts in what direction on a falling object? a) upward b) sideways c) downward d) both upward and downw ...
... c) total velocity of the objects d) air resistance between them 7. The force of gravity on an object is known as its _______________. a) acceleration b) mass c) weight d) velocity 8. Air resistance acts in what direction on a falling object? a) upward b) sideways c) downward d) both upward and downw ...
Part I
... • Fr is NOT a new kind of force. Exactly what it is depends on the problem. It could be string tension, gravity, etc. It is the right side of ∑F = ma, not the left side! (It is the form of ma for circular motion) ...
... • Fr is NOT a new kind of force. Exactly what it is depends on the problem. It could be string tension, gravity, etc. It is the right side of ∑F = ma, not the left side! (It is the form of ma for circular motion) ...
I. Newton`s Laws of Motion
... First Law of Motion An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force force. ...
... First Law of Motion An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force force. ...
Revision Semester 2 Physics test File
... 2. As a rocket takes off to the sky, it’s speed increases. Explain why. F = m × a; Newton second law states that acceleration of an object is directly proportional and in the same direction as the applied force, and inversely proportional to its mass. Therefore, as the rocket takes off to the sky, i ...
... 2. As a rocket takes off to the sky, it’s speed increases. Explain why. F = m × a; Newton second law states that acceleration of an object is directly proportional and in the same direction as the applied force, and inversely proportional to its mass. Therefore, as the rocket takes off to the sky, i ...
What are Forces?
... What are forces? • A force is a push or a pull. • We learned that Newton’s 2nd Law states that a Force is equal to the mass of a moving object times its acceleration. • We learned that Newton’s 3rd Law states that for every force there is an equal and opposite reaction force. ...
... What are forces? • A force is a push or a pull. • We learned that Newton’s 2nd Law states that a Force is equal to the mass of a moving object times its acceleration. • We learned that Newton’s 3rd Law states that for every force there is an equal and opposite reaction force. ...
Newton`s Second Law Spring/Mass Systems: Free Undamped
... A mass weighing 4 lbs stretches a spring 8 inches. At t = 0, the mass is released from a point 10 inches below the equilibrium position with an upward velocity of 3/4 ft/sec. Determine the equation of free motion. Determine the period of free vibrations and its frequency. ...
... A mass weighing 4 lbs stretches a spring 8 inches. At t = 0, the mass is released from a point 10 inches below the equilibrium position with an upward velocity of 3/4 ft/sec. Determine the equation of free motion. Determine the period of free vibrations and its frequency. ...
Chapter Test A - cloudfront.net
... 18. Friction between the car’s tires and the track provides the centripetal force. 19. No, there is only an inward force causing a deviation from a straight-line path. The tendency to move in a straight line away from the circular path is inertia. 20. A satellite in a circular orbit around Earth mov ...
... 18. Friction between the car’s tires and the track provides the centripetal force. 19. No, there is only an inward force causing a deviation from a straight-line path. The tendency to move in a straight line away from the circular path is inertia. 20. A satellite in a circular orbit around Earth mov ...
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.