Inertial mass is a measure of an object's resistance to changes in its motion when subjected to external forces. It quantifies how difficult it is to accelerate or decelerate an object.
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Acceleration is the rate at which an object changes its velocity over time. It depends on both the magnitude and direction of the applied force.
Weightlessness: Weightlessness occurs when an object experiences zero apparent weight due to being in freefall or experiencing negligible gravitational forces. It does not mean there is no gravity present, but rather that there are no normal contact forces acting on the object.