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    Can any one explain what "mass is a measure of inertia" means in understandable terms?

    Many thanks.
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    Well inertia is the reluctance of a body to change its motion, i.e. to start motion or to stop/change direction. And the more mass a body has, the more inertia the body has. So a big heavy object is very hard to set into motion or to stop/change its direction and so has a lot of inertia whereas a feather has a very small inertia.
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    Strictly speaking there is two types of masses in Physics.
    Inertial Mass
    Gravitational Mass

    Inertial mass is the ability of an object to resist acceleration (F = mia)
    Gravitational mass is how much 'gravitational force' an object produces/feels in a gravitational field (Gmgr-2 = g)
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    (Original post by Mehh)
    Strictly speaking there is two types of masses in Physics.
    Inertial Mass
    Gravitational Mass

    Inertial mass is the ability of an object to resist acceleration (F = mia)
    Gravitational mass is how much 'gravitational force' an object produces/feels in a gravitational field (Gmgr-2 = g)
    But so you don't get confused, these two have been measured and correspond exactly down to a massive number of decimal places, so they are considered the same. That's why you can cancel the m's in situations where you equate F = ma with F = GMm/r^2.
 
 
 
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