Non applied inertia

[sciencerocks]

I know that inertia applies to everything because everything has mass. However, I am just curious about this...

If inertia did not apply to some object, how would acceleration, velocity, speed, direction, distance, displacement and position be affected?

[James R]

Well, inertia roughly equates with mass, so an object without inertia would have zero mass.

The main effect would be that the slightest push would accelerate the object to light speed instantly.

[CANGAS]

That may be how photons and neutrinos do it. And it could help explain their braking performance too.