When do we use the word pressure instead of force? I think pressure and force are same. Please explain without including the formula. In the example of nail penetrating into the wall whereas if we invert the nail and then it will be hard to penetrate this example doesn't help me. I think here there is only requirement of force nothing else.
Answer
I'll give you a short but better example.
Consider a plain circle made of clay. It will have a certain weight, whatever it is. Weight is the force that pushes it downwards.
If you put that circle on a water surface, it might float.
Now, take the circle and convert it into a sphere with your hands. Now the sphere does sink.
You will agree that the force is the same, because there is the same amount of mass. The mass has only been redistributed, but the amount is the same, so the weight is the same, same force.
However, now it sinks, because that force is being divided in a much smaller area.
The force is the same in both cases. The pressure is bigger in the second case, because pressure is the ratio of force divided by area.
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