Mass and weight are important for understanding how objects move. These ideas are explained by Newton's Laws. Let's break it down simply:

1. What They Mean:

   • Mass is how much stuff is in an object. It doesn’t change, no matter where you are. We measure mass in kilograms (kg).
   • Weight is the pull of gravity on an object. It tells you how heavy something is. You can find weight using this formula: $W = mg$. Here, $g$ is the force of gravity, which is about $9.81 \, \text{m/s}^2$ on Earth.

2. Newton's Second Law:

   • This law says that how fast an object speeds up (called acceleration, or $a$) depends on two things: the force acting on it ($F$) and its mass ($m$). The formula is $F = ma$. This means if the force stays the same, how heavy the object is will change how fast it speeds up.

3. How This Affects Motion:

   • If an object is heavy (has a larger mass), it won’t speed up as much when you push it with the same force. On the other hand, a lighter object will speed up more easily when you push it.

Knowing this helps us understand why heavier things feel harder to move and don’t speed up as quickly as lighter things when we give them a push!