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20 Oct 2007 11:26:04 IST

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pseudo force

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pseudo force concept

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aNdRoMeDa

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Joined: 10 Sep 2007

Posts: 1319

20 Oct 2007 11:29:17 IST

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pseudo force is an imaginary force .....

wich is considered 2 apply newton's 2 nd law in non...inertial frames....

it's direction is opp. 2 d direction of d acc...of d frame..

& i's magnitude is=mass of d object..* acc of d frame...

...hope ur clear...

do rate my reply...........

viswesh Nrayanan

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Joined: 9 Oct 2007

Posts: 73

20 Oct 2007 11:39:44 IST

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Without use of pseudo force u can solve all the problem of newtons law........its just a mathematical triick to solve it more quickly and easily......but u will make mistakes if u are not clear of using it......my advise is better dont use it.........

ridhima gupta

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Joined: 27 Jun 2007

Posts: 178

20 Oct 2007 11:47:07 IST

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all the newton's forces are applicable only in an inertial frame(non accelerating frame )
but newton's law's have become a common phenomenon that we want to apply even when we are in a non inertial frame....
we can do this by applying an imaginary force = the mass of body observed*the acc. of the non inertial frame of reference ........ in the direction opposite to the acc. of non inertial frame...
this is done as the person in non inertial frame(acc. frame) will not find any acc. of object kept on his frame(eg a moving car and a person observing the steering wheel)
so to balance the forces this is done

hope u got the concept......
do rate if u find it useful

edison

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Joined: 19 Oct 2006

Posts: 7537

21 Oct 2007 00:08:09 IST

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The concept of ?pseudo-force?, is postulated in order to be able to

apply Newton?s laws of motion to non-inertial or accelerated frames of reference. This

needs some elaboration. The equation F = ma has two sides. The right hand side is

obtained by studying the kinematics of the body. The left hand side, on the other hand,

gives the physical cause, which we call interaction of the body with something

external. For example, in the case of the earth moving around the sun, the physical

cause is the gravitational pull of the sun on the earth. For a revolving stone attached to

a string, the tension in the string provides the force that produces the necessary

centripetal acceleration. Now suppose, you are sitting on a stool in a room and seeing

the other things around you at rest. Then suddenly the stool starts vibrating with a small amplitude. You would now find that the other things around you are vibrating.

Since vibration means acceleration, it would mean that, in your frame of reference,

these objects are accelerating in directions opposite to your own. If you believe in

Newton?s laws, you would immediately conclude that some force must be acting on

these objects. But, in fact, you know that these ?vibrating? objects are not having any

physical interaction with anything external. Hence in this case, we cannot apply the

equation F = ma. But if we wish this equation to remain valid even in this accelerated

(or non-inertial) frame of reference, then we will have to assume that a force given by

F = ma, where a is the perceived acceleration of the objects is acting upon them. Such

a force is termed ?pseudo-force?. Interestingly, some prefer to call pseudo-forces

?inertial forces? in spite of the fact that their use is perceived in non-inertial frames of

reference.

Centrifugal force is the pseudo-force experienced by the observer in a rotating

frame of reference. In case of the earth it is called Coriolis force (first described by

Gaspard de Coriolis in 1835) because of which an object moving relative to the earth

is deflected from its path (as viewed from the earth) due to earth?s rotation. In case of

a car taking a bend, centrifugal force is experienced by the passenger as an outward

acting force pushing him against the door.

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