Physics is not 'experience'.
Science is not observations. All observations are subject to the problems of phenomenology.
Newton's laws do exactly that.
A constant is not a law.
A constant is not a law.
A constant is not a law. As for Newton's law of gravitation, you can read that 'why' in his book, the Principia. It describes how that theory was created, and the law the accompanies it.
There is just one. Illiteracy: Plural used for singular object.
A theory of science does not predict. Science is an open functional system. It must be transcribed into a closed functional system such as mathematics. Only closed functional system have the power of prediction. That transcription is called a 'law' of science.
A theory is an explanatory argument. A theory of science is no different.
A theory is not knowledge. It is not 'understanding'. It is a THEORY.
You don't get to speak for Newton.
He DID show why. Go read his book.