IIT JEE , AIEEE Forum - Physics , Mechanics

shreyasnivas

ok its simple.

in a totally ideal situation (NEVER HAPPENS) the stick if kept perfectly vertical, will not fall.(no wind also)

but in our every day life, there is wind factor(the tiniest wind can topple stuff).
and also we dont have a perfect horizontal surface, so a perfectly vertical rod is impossible.

the rod, when pushed by the slightest disturbance, will develop a torque with the
1)normal reaction
2) weight (MG)
(see diag 1)

actually the normal reaction does not affect torque since it passes through the point of rotation.(i put it for the balancing force)

now this weight torque will make it fall faster and faster.

basically a balance can be made if all torque is balanced.we see so many people on tv who balance rocks and chairs and all. there the body is tilted so that the weight is directed opp to normal reaction(diag 2), so no torque, and forces cancel also.

this hopefully asnwers your questions

cheers

shreyas

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