# How does gravity affect weight?

##### 1 Answer

In a stronger gravitational field a given mass will have a larger weight.

An object's weight is given by this equation:

Gravitational field strength at a distance, r, from a centre of mass is given by this equation:

If an object is nearer a centre of mass then r will be smaller so g will be larger. In that case the weight of the object will be larger. If an object is moved from a distance R away from one centre of mass and placed a distance R away from the centre of a smaller mass then g will be smaller. In that case the weight of the object will be smaller.

**A practical example:** if an astronaut on earth has a weight of 833 N, on the moon he/she will have a weight of 136 N.

Using

So the weight on the moon (