The Tricky Part
Many people confuse mass with another measurement called weight. But mass and weight are not the same thing.
Since mass is the amount of matter in an object, it does not change when the object is moved to another location. Your mass will be the same on Earth, the Moon, Pluto and Mars.
But your weight will change.
Weight is a measurement that describes the amount of force gravity exerts on an object. This measurement will change depending on the gravitational pull at the location of measurement. If you measure your weight on Earth it will be different on the Moon--you will weigh less because the Moon has a smaller gravitational pull.
Did you know astronauts have been known to get sick from the sensation of being weightless? This condition is called SAS (Space Adaption Syndrome). Although they train to avoid it, astronauts can suffer from nausea, dizziness, disorientation and vomiting! Gross!
Having Trouble Remembering The Difference?
Just look at the first letters of Mass and Weight.
"M" is a sturdy letter that stands on its own. It won't be pushed around so we know it will stay the same no matter what.
"W" is a wobbly worm. It sits on its bottom and wiggles around. "W" can't stand on its own--so its sure to change. Just like your weight!