What does -9.8 m/s² really mean? Acceleration due to gravity | Class 11 Physics

Can you visualize what really happens to the kinematics of an object falling under the force of gravity? An interesting way to visualize this is to write the value of g that is 9.8 m/s² as 9.8 m/s/s. When you write g this way, it will give you a sense of how the force of gravity changes the velocity and position of an object. It simply means that an object subjected to an acceleration of -9.8 m/s² will have its velocity increasing by 9.8 m/s every second. And since the velocity is increasing every second, the distance covered also increases every passing second.  

Now when we use g in various problems, we must remember that g is a vector and since it always points downwards, that is the negative direction of Y axis, it is always to be taken as -9.8 m/s²

So while the magnitude of g is 9.8 m/s sq, when you use it in any equation you should put -ve sign as well.

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