# Mass and Weight

1. May 21, 2009

### Vorbis

Sorry for the unoriginal question but what is the differnece between mass and weight? Its been bothering me lately Does mass change? What exactly is mass?

2. May 21, 2009

Check wikipedia:
So your weight on the moon is less albeit your mass is the same.

What is mass?
Mass is the m in $$F=m\cdot a$$
And Mass is what causes gravity.

Mass is where the search ends, we haven't discovered some inner mechanism that produces it.

3. May 21, 2009

### Vorbis

What do the veriables mean in the formula?

4. May 21, 2009

### ZapperZ

Staff Emeritus
5. May 21, 2009

### Vorbis

Thanks zapper