## DISCUSSION FORUM

### RBD

by Manoj Kumar -
Number of replies: 2

Is it true that we can apply toque = moment of inertia Xangular acceleration only when moment of inertia about the axis which we are considering should remain constant

In reply to Manoj Kumar

### Re: RBD

by vishal deoarshi -

The general Newton second law F = dp/dt where F is generalized force and p is generalized momentum. If you linear variable then F becomes force and p is linear momentum whereas if you take angular variable then  F is torque and p is angular momentum. If inertia is constant then it goes to F=ma and m is generalized mass

In reply to vishal deoarshi

### Re: RBD

by Manoj Kumar -
I just want to ask ok weather the formula of linear momentum = moment of inertia x angular velocity is more fundamental or the formula torque equal to moment of inertia x angular acceleration is more fundamental
Is this the same that when we use the variable mass system then we we generally use the formula dp/dt = Force ...
when the mass is constantt it becomes F=ma similarly can we say that L=Iw is more fundamental than torque =I x aplha which can be obtained when moment of inertia is constant