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Mechanics

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20 Sep 2007 13:24:17 IST

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should a trajectory of a projectile necessary be a parabola.........?

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sanjay Natraj

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Joined: 20 Sep 2007

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20 Sep 2007 13:24:53 IST

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No it is not necessary

Shikhar Shukla

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Joined: 17 Sep 2007

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20 Sep 2007 14:38:27 IST

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it will be parabolic only for small heights.it 'll not be parabolic if:

(a)change in value of g with height is taken into account(refer topic -GRAVITATION)

(b)it is thrown vertically upwards or downwards.

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Krishna Gopal Singh

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Joined: 29 Dec 2006

Posts: 5153

20 Sep 2007 23:04:18 IST

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Perfect answer shikhar. Actually any particle in a constant force field with its initial velocity different from the direction of that constant force will have parabolic trajectory.
So two important things are:
Force is constant
Initial velocity is not in the direction (or opposite) to force

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