The property of an object which determines how much inertia it has is Mass. Law of inertia = The object in motion will continue in motion unless acted upon by an unbalance force (net force).Click to see full answer. Also to know is, what property of an object determines how much inertia it has quizlet?The amount of mass an object has.Also, what has more inertia a hammer or feather? Thus it will fall faster than a less massive object. Galileo accounted for the inertia of falling objects. So although the lead ball would be heavier than a wooden ball of the same size, it would also have more inertia. One argument against Galileo was what one could plainly see when one drops a hammer and a feather. Considering this, what properties determine an object? Density is an important physical property. Density is the mass of a substance per unit volume. Volume is the amount of space an object occupies. Chemical properties- These are properties that can only be observed by changing the identity of the substance.What has the most inertia? Mass