Physics > Rotational Dynamics > 1.0 Introduction
Rotational Dynamics
1.0 Introduction
1.1 Torque or moment of a force
1.2 Relation between torque and moment of inertia
1.3 Pseudo torque
1.4 Torque equation
1.5 Principal of moments
2.0 Angular momentum or moment of a momentum
3.0 Relation between torque and angular momentum
4.0 Combined translational and rotational motion of a rigid body
5.0 Rotational kinetic energy
6.0 Uniform pure rolling
7.0 Accelerated pure rolling
8.0 Instantaneous axis of rotation
9.0 Toppling
1.5 Principal of moments
1.2 Relation between torque and moment of inertia
1.3 Pseudo torque
1.4 Torque equation
1.5 Principal of moments
According to the principal of moments, a body will be in rotational equilibrium if vector sum of the moments of all the forces or torque acting on the body about a fixed point is zero.
When the system is in rotational equilibrium then, $${\overrightarrow \tau _{net}} = 0$$
So, we can say that the turning effect of the forces in the clockwise direction is equal to the turning effect of the forces in the anti-clock wise direction.
Mathematically, $${\left( {{\tau _{net}}} \right)_{clockwise\;direction}} = {\left( {{\tau _{net}}} \right)_{anti - clockwise\;direction}}$$
