Why does mass remain the same but weight changes on different planets?

The mass of an object is the measure of its contents but weight is the force due to gravity. And, the force due to gravity changes on different planets.

We know, that on earth g = 9.8 m/s²

And on moon its, g = 1.6 m/s²

Let’s understand this by an example:

Example:

1. Calculate the weight of an object on the moon which weighs 50kg on earth.

Ans:

Here weight = mass x gravitational acceleration

                  = m x g

    = 50 kg x 1.6 m/s²

                 = 80 Kg m/s²

So, as we can clearly see from this example, if your friend’s weight is 50kg on this planet, they will be 80kgs on the moon! 

Now, Calculate your weight on the moon.