Angular Momentum?

Question

1. When developing the expression for the angular momentum of a particle, a step occurs where mv × v is set to zero. The reason for this is... v = 0, the cross product of a vector with itself is zero, m = 0?
2. The torque can be expressed as the time rate of change of the.... moment of inertia, linear momentum, angular momentum?
3. In the “Newton’s second law in angular form", τnet is... the torque due to all forces, the torque due to external forces only, the torque due to internal forces only?
4. When the angular momentum changes, the change in the angular momentum vector is.. parallel to the force vector, parallel to the angular momentum vector, parallel to the torque vector?

Answer 1

1. A vector crossed with itself is zero.
2. Torque is the time rate of change of angular momentum.
3. Torque is due to external forces only.
4. The change in angular momentum vector is parallel to the torque vector.