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# Can Anyone Tell Me What This Means? watch

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

Many thanks.
2. 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.
3. 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)
4. (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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