_____________ is a measurement of how much matter an object is made out of.
In the SI system, weight is measured in several units, including _____________, _____________ and _____________.
_______________is a measurement of the force of gravity on an object.
In the SI system, weight is measured in _______________.
When we travel to a different planet, like Mars, our ____________ changes.
Our _____________ does not change when we travel to a different planet.
Our weight changes because the force of ____________ is different on different planets.