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Mass is the measure of inertia and if you change the mass the inertia will change.
Inertia does not affect gravity, these are two entirely separate things, even though they both are produced by the same thing, which is mass. Mass creates both inertia and gravity, but inertia and gravity do not affect each other.
Inertia is related to mass; you might say that inertia IS mass. The objects which have the most inertia are the most massive objects. Those are also the heaviest objects, since mass affects weight.
Its mass
Mass
The amount of inertia of a body is determined by its mass - the greater the mass, the greater the inertia. Inertia also depends on the distribution of mass within the body - objects with more of their mass concentrated towards the outer edges have greater inertia. Additionally, the shape and size of an object can affect its inertia - larger and more compact objects tend to have more inertia.
Gravity and inertia are both fundamental forces that affect the motion of objects. Gravity is the force that pulls objects towards each other, while inertia is the tendency of objects to resist changes in their state of motion. Both gravity and inertia play important roles in determining how objects move in the universe.
Friction opposes the motion of objects, which can affect their inertia by slowing them down or preventing them from moving. Inertia is the tendency of objects to resist changes in their state of motion, so friction can either help overcome inertia by bringing an object to rest, or maintain its state of motion by providing a force in the opposite direction.
Mass
A change in mass affects the motion of an object by altering its inertia. Objects with greater mass have greater inertia and require more force to accelerate or decelerate compared to objects with lesser mass. As a result, changes in mass can affect how quickly and easily an object can change its velocity.
The mass of an object has the most effect on its inertia. Inertia is the tendency of an object to resist changes in its motion, and this resistance is greater for objects with more mass.
The mass of an object has the most effect on its inertia. Inertia is a measure of an object's resistance to changes in its state of motion, and the greater the mass of an object, the greater its inertia.