Concept Questions
... Answer 3. Energy is not conserved because there are energy losses due to kinetic friction. Angular momentum about the center of mass is not constant because the friction exerts a torque about the center of mass. Angular momentum about a fixed point on the ground is constant because the sum of the to ...
... Answer 3. Energy is not conserved because there are energy losses due to kinetic friction. Angular momentum about the center of mass is not constant because the friction exerts a torque about the center of mass. Angular momentum about a fixed point on the ground is constant because the sum of the to ...
Universal Gravitation
... • Newton proposed that an attraction between bodies is universal. • Gravitational force is extremely weak between ordinary objects. • Objects with enormous mass have significant gravitational force. Creates orbits Creates tides Is known as weight for objects on the surface. ...
... • Newton proposed that an attraction between bodies is universal. • Gravitational force is extremely weak between ordinary objects. • Objects with enormous mass have significant gravitational force. Creates orbits Creates tides Is known as weight for objects on the surface. ...
astrocoursespring2012lec4
... active process of star formation. Now it is time to go beyond the disk of the Milky way to observe Globular Clusters… ...
... active process of star formation. Now it is time to go beyond the disk of the Milky way to observe Globular Clusters… ...
Introduction to Dark Matter
... in the form of the Cosmic Microwave Background Radiation (CMBR; often referred to as the “afterglow” of Big Bang) which can be observed at T ≈ 2.73 K with radio telescopes. In order for astrophysical objects like galaxies, star clusters and stars to form, density fluctuations must have been present ...
... in the form of the Cosmic Microwave Background Radiation (CMBR; often referred to as the “afterglow” of Big Bang) which can be observed at T ≈ 2.73 K with radio telescopes. In order for astrophysical objects like galaxies, star clusters and stars to form, density fluctuations must have been present ...
Newton`s law of universal gravitation
... Floating in Space • The dial on the scale shows the upward force exerted by the scale, which is your weight. • Now suppose you stand on the scale in an elevator that is falling. • If you and the scale were in free fall, then you no longer would push down on the scale at all. • The scale dial would ...
... Floating in Space • The dial on the scale shows the upward force exerted by the scale, which is your weight. • Now suppose you stand on the scale in an elevator that is falling. • If you and the scale were in free fall, then you no longer would push down on the scale at all. • The scale dial would ...
For an object travelling with “uniform circular motion,”
... 14. Describe how the acceleration of gravity on Earth’s surface would be different if both its mass and radius were twice their present values. Provide reasons for your answer. 15. A 0.50-g insect rests on a compact disc at a distance of 4.0 cm from the centre. The disc’s rate of rotation varies fro ...
... 14. Describe how the acceleration of gravity on Earth’s surface would be different if both its mass and radius were twice their present values. Provide reasons for your answer. 15. A 0.50-g insect rests on a compact disc at a distance of 4.0 cm from the centre. The disc’s rate of rotation varies fro ...
4-7 Solving Problems with Newton`s Laws: Free
... A friend has given you a special gift, a box of mass 10.0 kg with a mystery surprise inside. The box is resting on the smooth (frictionless) horizontal surface of a table. (a) Determine the weight of the box and the normal force exerted on it by the table. (b) Now your friend pushes down on the box ...
... A friend has given you a special gift, a box of mass 10.0 kg with a mystery surprise inside. The box is resting on the smooth (frictionless) horizontal surface of a table. (a) Determine the weight of the box and the normal force exerted on it by the table. (b) Now your friend pushes down on the box ...
Dynamics: Newton’s Laws of Motion
... First Law – Every object continues in its state of rest, or of uniform velocity in a straight line, as long as no net force acts on it. First Law – (Common) An object at rest remains at rest, and a object in motion, remains in motion unless acted upon by an outside force. ...
... First Law – Every object continues in its state of rest, or of uniform velocity in a straight line, as long as no net force acts on it. First Law – (Common) An object at rest remains at rest, and a object in motion, remains in motion unless acted upon by an outside force. ...
Newton`s Law Concept Test
... After the cart is released, there is no longer a force in the x-direction. This does not mean that the cart stops moving!! It simply means that the cart will continue moving with the same velocity it had at the moment of release. The initial push got the cart moving, but that force is not needed to ...
... After the cart is released, there is no longer a force in the x-direction. This does not mean that the cart stops moving!! It simply means that the cart will continue moving with the same velocity it had at the moment of release. The initial push got the cart moving, but that force is not needed to ...
File
... When an object slides down a frictionless incline PEtop = KElin at bottom But when an object rolls, it takes some of its NRG just to spin (KErot), so then there’s not as much left to move it down the plane (KElin) PEtop = KEroll at bottom = KErot at bot + KElin at bot But how much of each KErot & K ...
... When an object slides down a frictionless incline PEtop = KElin at bottom But when an object rolls, it takes some of its NRG just to spin (KErot), so then there’s not as much left to move it down the plane (KElin) PEtop = KEroll at bottom = KErot at bot + KElin at bot But how much of each KErot & K ...
Chapter 12 Notes - Crestwood Local Schools
... Pressing your hand against a wall produces a pair of forces. As you press against the wall, your hand exerts a force on the wall. This is an action force. The wall exerts an equal and opposite force against your hand. This is a reaction force. Some action-reaction forces produce motion. An example w ...
... Pressing your hand against a wall produces a pair of forces. As you press against the wall, your hand exerts a force on the wall. This is an action force. The wall exerts an equal and opposite force against your hand. This is a reaction force. Some action-reaction forces produce motion. An example w ...
Circular Motion Lab
... • To get started, tie a knot at the end of your string that will act as a stop. It is important to make a good stop so that your masses do not fly off when you start swinging your string. We don’t want anyone getting hurt. • To calculate velocity, use your stopwatch and the equation for the circumfe ...
... • To get started, tie a knot at the end of your string that will act as a stop. It is important to make a good stop so that your masses do not fly off when you start swinging your string. We don’t want anyone getting hurt. • To calculate velocity, use your stopwatch and the equation for the circumfe ...
Black Hole - The Crowned Anarchist Literature
... speculated that large volumes of interstellar gas collect and collapse into supermassive black holes at the centres of quasars and galaxies. A mass of gas falling rapidly into a black hole is estimated to give off more than 100 times as much energy as is released by the identical amount of mass thro ...
... speculated that large volumes of interstellar gas collect and collapse into supermassive black holes at the centres of quasars and galaxies. A mass of gas falling rapidly into a black hole is estimated to give off more than 100 times as much energy as is released by the identical amount of mass thro ...
PHYS140 - Ch4.pptx
... Newton’s Second Law of Motion An object’s mass is a measure of its inertia. The more mass, the more force is required to obtain a given acceleration. The net force is just the vector sum of all of the forces acting on the body, often wri]en as ΣF. ...
... Newton’s Second Law of Motion An object’s mass is a measure of its inertia. The more mass, the more force is required to obtain a given acceleration. The net force is just the vector sum of all of the forces acting on the body, often wri]en as ΣF. ...
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.