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![[Post New]](/templates/default/images/icon_minipost_new.gif) 10 Nov 2007 20:41:33 IST
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When a Body is being whirled in a horizontal circle with the help of a string, the net downward force is mg. But there is no accelaration in the downward direction.
Please explain....
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10 Nov 2007 20:43:56 IST
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The tension component cancels it out.
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10 Nov 2007 20:45:06 IST
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but the tension acts horizontally...
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"I a universe of atoms.......an atom in the universe" |
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10 Nov 2007 20:47:41 IST
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but the tension acts horizontally....
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11 Nov 2007 00:54:24 IST
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well gud ques.....
i think that tho in real life perfect horizontal circular motion is possible but if u try to do the same in vacuum, it wud require infinite angular acceleration and hence infinite tension
see in real life other things like air drag and air pressure balance a part of mg. the rest part is balanced by the the vertical component of tension bcoz perfect circular motion is hardly achieved and during nearly horizontal circular motion the tension force is large in magnitude so even a small component of it balances a large portion of mg
rate if this helps u and correct if wrong...
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11 Nov 2007 01:04:02 IST
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Well, i don't think so, mg and tension are both nullified by centrifugal force.
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11 Nov 2007 18:30:20 IST
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well wat i think is here tension acts like a force which immediately comes into play when the body is accelerated down(when it tries moves down) and the tension component cacels it out.
i am not sure about it but the best reply i could think.
Common friends solve this!!!
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11 Nov 2007 18:37:22 IST
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see when u try to rotate a an object ,say a ball tied to a string
if u see carefully u will notice that u are exerting an upward force on the string.in order to move the ball gorizontally u rotate ur hand
about the central axis in a conical fashion.which if u see hass a component in the upper direction.
plz correct me if i'm wrong
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11 Nov 2007 19:14:50 IST
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i dont think ...its the tension that balances....but its the force which we apply in order to ...keep it in the air....tension provides centrifugal force...and if u ....keenly watch...u leave the string ...it moves tangentially...as well as in the downward direction ...coz now (even if we neglect the amount of air resistance...or air drag) there is no constraint ....in the motion of the particle...so ..it moves downward ...before we were applying ...a force so nt known....inorder to keep it in the air....and one more thing i would like to ask all those who said tension (purely tension..) had it been so ..it should have also performing without exerting any force by our hand..so why does it fall off...if u cease applying the force...??and i think madman ..is correct upto a certain level...tell me if i am wrong...i m nt 100% sure
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12 Nov 2007 18:06:49 IST
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please reply
I have rated everyone....
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12 Nov 2007 18:07:20 IST
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more answers required
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12 Nov 2007 18:14:00 IST
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Hi guys, Well this is a nice question and there are some gud arguments on this ..
But I wud like to ans this in a different way..please hav patience to read till the end..
for that lemme first tell u about the canti levers.
Its beam fixed at one end and free at other end . If the weight applied at the free end is nigligibly very less and the strength of the beam is hight enough then there will be no bending of the beam.
but u must be wondering in our case we have a flexible string not a beam. however we sud note that the string is in high tension now due to centrifugal force. Think of the clips ( used for clutching clothes on the wire to dry them)!! when it is hanging alone (without any clothes) then the wire remains staight, no depression. because the weight of the clip is very compared to the tension in the wire, But as soon as we put a wet jeans on the wire it bends as the weight of jeans is quite high.
thinkin i the same context. now in our case of circular motion. the rorating string is acting like a cantilever, with a vertical weight on its free end. As the weight at the free and is vertically downward. it gives a bending moment to the string ( which is now in high tension due to the centrifugal force.) now the bengin moment by the weight must be counter balanced some how. so think of the point on the string which is held. There we are counteracting the bending moment so as to get balanced by every respect.
Reply if u r facing any issue to get this ..
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12 Nov 2007 18:33:07 IST
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ur concept is wrong the ne tdownward force is mg indeed but the net force of tension and mg provides sufficient centripetal force which is directed towards centre.and hence tangential and radial aceelerations exist but not downward acceleration there is no centri fugal force becoz it is inertial frame
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12 Nov 2007 18:50:58 IST
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neglect gravity and watch the effect.perfectly horizontal circular motion not possible in practical life. i'll bet you never come across such a question as yours in text books. keep cool.
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12 Nov 2007 18:53:50 IST
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