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Confidence votes 317. Inertia is rotary momentum; an object's ability to continue spinning when a decelerating force is applied. Just as a heavy object takes more effort to stop from the same speed as a light object, so does a heavy object take more effort to stop from turning at the same speed as a light object. So assuming they are turning at the same angular velocity, the heavier one has a larger inertia.
Mass and Weight. Your weight on the planet Earth is a function of our planet's mass. The mass of an object is a measure of how much matter it contains. If you had two bricks, one made of concrete and one made of lead, the lead brick would weight much more.This is because it contains more matter and is therefore more massive.lanets and moons are very massive objects and have a very strong pull on other objects. This phenomenon is known as gravity. More massive objects have a stronger pull than less massive objects. This is why you weigh more on larger, more massive planets like Jupiter and less on smaller, less massive planets like Mars.