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When a body rolls down, it has linear acceleration in downward direction. The friction, therefore, acts upward to counter sliding tendency as shown in the figure. This friction constitutes an anticlockwise torque providing the corresponding angular acceleration as required for maintaining the condition of rolling (if linear velocity is increasing, then angular velocity should also increase according to equation of accelerated rolling). Rolling down an incline
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submitted by Rohitair1 (137 m) on 3 Dec 2008 17:33:03 IST (0 comments 46 views)
I am sharing with you the way you should generally approach a problem in mechanics.VECTORSWhen you need to add two or more vectors, use this step-by-step procedure:? Select a coordinate system that is convenient. (Try to reduce the number of components you need to find by choosing axes that line up with as many vectors as possible.)? Draw a labeled sketch of the vectors described in the problem.? Find the x and y components of all vectors and the resultant components (the algebraic sum of the components) in the x and y directions.? If necessary, use the Pythagorean theorem to find the magnitude of the resultant vector and select a suitable trigonometric function to
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submitted by nishant_88 (299 m) on 7 Sep 2007 21:47:07 IST (8 comments 363 views)
HI EVERYONE HERE ARE SOME QUSTIONS FROM THE KINEMATICS PORTION TO GIVE U A QUICK REVISION. (contains both simple and a bit tough ones. hunt for them first.) here we go:- 1- A man swimming down stream overcome a float at point M.After travelling distance D he turned back and passed the float at a distance of D/2 from the point M,then the ratio of speed of swimmer with respect to still water of the river will be....................(ans) 2- A speeder in an automobile passes a stationary policeman who is hiding behind a hill board with a motorcycle.After a 2 sec. delay the policeman accelerates to his maximum speed of 150km/hr in 1
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submitted by gr8kartekay (283 m) on 28 Mar 2007 17:43:51 IST (7 comments 450 views)
This is my first article : - Mechanical energy is the sum of potential & kinetic energy. - Potential energy can be due to gravitation or in other forms like an extended or compressed spring. - The formula, that the potential energy of a body at a height h = mgh where g is the acc. due to gravity which is treated as constant,is valid only when h is very small compared to the radius of the earth. - The potential energy at a distance r from the centre of earth is &nb
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submitted by swati.07 (845 m) on 25 Feb 2008 08:09:39 IST (40 comments 1279 views)
QUANTUM MECHANICS Quantum mechanics is the branch of physics treating atomic and subatomic systems and their interaction with radiation in terms of observable quantities. It is based on the observation that all forms of energy are released in discrete units or bundles called "quanta". Remarkably, quantum theory typically permits only probable or statistical calculation of the observed features of subatomic particles, understood in terms of wave functions. The Schrödinger equation p
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submitted by genius143 (10 m) on 7 Apr 2008 20:29:10 IST (3 comments 145 views)
You know when Newton presented his findings and hypothesis on the laws of motion the discoveries didnt get immediate acceptance as was obvious in those days. A number of paradoxes were also there which somehow totally ruled out Newtons Theory in Mechanics( some of which have been enlisted below!!!) 1) A...................B......................C.............................................D Firstly someone said that motion doesnt exist meaning that howwoever we move there is nothing like relative displacemnt taking place and we cant reach from one place to the other. A very vague proof was given on this account For
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submitted by taruntanuj007 (247 m) on 23 Mar 2007 13:15:24 IST (2 comments 204 views)
In vectors 2+2 is not equal to 4. It could be anything between from -4 to +4 depending on the angle between the two vectors. Taking the components of a vector along X and Y axes has the advantage of that all the X components can be added together and the same with Y components.Then the resultant is obtained. Vector product of 2 vectors means the product of the two vectors is a vector. A scalar product of two vectors is a scalar. It is also a product of 2 vectors.The scalar product of displacement and force vectors gives work done. If the force also have a perpendicular component , then the cross product between them yields torque .Just as a force causes a d
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submitted by beethoven (161 m) on 26 Aug 2007 22:24:48 IST (5 comments 205 views)
Newton's First Law Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies; in fact, the First Law is just a special case of the Second Law for which the net external force is zero. Newton's First Law contains implications about the fundamental symmetry of the universe in that a state of motion in a straight line m
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submitted by vinyassingh (675 m) on 23 Jun 2007 18:58:53 IST (6 comments 396 views)
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