IIT JEE , AIEEE Forum - Physics , Mechanics

VARSHINI

Look i just get confused or forget the formulae of moment of inertia,Suggest me any of the ways 2 remember or important notes 2 make my concepts stronger.

bhuwanaroracorroded

look greater d mass concentrated about axis of rotation

lesser wil b d moment of inertia

take any case moment of inertia

I for ring > disc

rate if satisfied

do ask if any other doubt

cool_sap

4 point mass system M.I=mr^2,m=mass,r=distance 4m axis

4 continuous mass system M.I=integration of dm*r^2.

4 objects such as sphere,ring etc. u can remeber it as

mr^2,and then put corresponding values of

,such as for ring

=1,disc

=2,hollow sphere

=2/3,solid sphere

=2/5.

u may also compress 3d objects to 2d objects as they will hav the same M.I

rate me if u find it helpful.

harsha_27

see as mass is to force M.I. is to torque that

is more the M.I. more difficult it is to

rotate

moment of inertia depends on the mass along

with its distance from the axis ........however

varies more with distance (as it is

r^2)

.............so if major amount of mass of the

whole body is concentrated away from the

axis of rotation, more difficult it will be to

rotate that body hence more will be the M.I.

............as an example u can take solid and

thin hollow spheres of same mass .....now

here , as the mass is concentrated at more

distance in hollow sphere its M.I. is more than

solid sphere...........understood???

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