isolated system

Does total linear momentum depend on the choice of inertial reference frame?

Yes. Linear momentum changes if you change inertial frames.

What is total linear momentum in the center-of-mass frame?

Always zero. In the COM frame, the COM is at rest → total momentum = 0.

Can total linear momentum of an isolated system change over time?

No. No external forces → total linear momentum is constant.

Does total angular momentum depend on the choice of inertial reference frame?

Yes. Changing the origin changes angular momentum.

What is total angular momentum in the center-of-mass frame?

Can be non-zero. Motion around the COM can produce angular momentum.

Can total angular momentum of an isolated system change over time?

No. No external torque → total angular momentum is conserved.

Does total kinetic energy depend on the choice of inertial reference frame?

Yes. Kinetic energy depends on speed, and speed depends on frame.

What is total kinetic energy in the center-of-mass frame?

Can be non-zero. Particles can move relative to the COM even if total momentum is zero.

Can total kinetic energy in the COM frame change over time?

Yes. Internal forces can convert potential ↔ kinetic energy.

Does total energy depend on the choice of inertial reference frame?

Yes. KE changes between frames, so total energy changes.

Can total energy in the COM frame change over time?

No. Total energy of an isolated system is conserved in time.