When we talk about weight and mass in physics, there are some common misunderstandings. Let’s break it down:

1. Weight vs. Mass:
   A lot of students think that weight and mass mean the same thing.
   But they are actually different!

   • Mass is how much stuff is in an object. It’s measured in kilograms (kg).
   • Weight is the force that acts on that mass because of gravity. It's measured in newtons (N).

   To find weight, we use this formula:
   ( W = mg )
   Here, ( m ) is mass, and ( g ) is the pull of gravity.

2. Weight Changes:
   Some people believe that weight stays the same everywhere.
   But that’s not true! Weight can change depending on how strong gravity is.

   For example, if you go to the Moon, you would weigh about 1/6 of what you weigh on Earth.
   But your mass would stay the same!

Understanding these differences helps us grasp how forces and motion work.