# Mass versus Weight - Comparison - Math 7th grade

can not find what to look under for the mass of the following &g,0.25kg,0.45kg

### Comments for Mass versus Weight - Comparison - Math 7th grade

 Mar 11, 2012 Mass versus Weight - Comparison by: Staff Question: can not find what to look under for the mass of the following &g,0.25kg,0.45kg Answer: For all practical purposes, the mass and weight of an object (a rock, for example) are the same when measured on earth at sea level. An object which weighs 0.25 kg has a mass of 0.25 kg. An object which weighs 0.45 kg has a mass of 0.45 kg. However, MASS and WEIGHT describe entirely DIFFERENT properties. MASS is a measure of the amount of physical material an object has. The mass of an object never changes. If the mass of an object (measured on earth as its weight) is 0.25 kg, that object will have a mass of 0.25 kg if it is taken to the moon, or is released to float in space. WEIGHT is a measure of the gravitational force which pulls on an object. The weight will change if the gravitational force changes. If an object weighs 0.25 kg on earth, it will weigh only 0.04 kg on the moon because strength of the gravity of the moon is only 1/6 the strength of the gravity on earth. If an object weighs 0.25 kg on earth, it will have a weight of 0 (zero) if it is released to float in space. Thanks for writing. Staff www.solving-math-problems.com