# sir,i am facing problems to build concepts of energy conservatios in chapters like wpe,impulse momentum and rotational..plz tell me wat to do????????

69 Points
13 years ago

Dear OCEAN GODRE,

1) learn the corodinate systems thoroughly

there are 3 coordinate systems\

a)   cartesian coordintae systems

using these coordinates u can solve momentums and energy in XYZ coordinates

example :  momentum along x-aixs     m1*v1+m2*v2=m1u1+m2u2 like this

b)polar coordinates

spherical coordinates system is confusing but see the directions of  r, θ, Φ  so that u can dived momentums along those axes.

Cylindrical coordinates

x=rcosθ

y=rsinθ

z=z

these are the 3 important coordinate systems u have to remember.

using these coordinate systems we can ddived energy conservatios impulse momentum and rotational into 3 axes. after that apply conservation of momentum in x direction and y direction and z direction

after that u have to have knowledge on how many types of energies are there. kinetic(if m has some speed) , potential(if m has some height) , rotational( if m is rotating)

impulse =mv/t

$K_{rotation} = \frac{1}{2} I \omega^2$

where

ω is the angular speed
$I \$ is the moment of inertia

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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