Looking at this world, we realise incomplete knowledge works. People in ancient times didn’t know Newton’s Laws or Automobile Engineering. Nevertheless, they were able to develop oxcarts and hand-pulled carts using wheels. These constructs allowed people to move from one place to another and transport goods although they were very slow and cumbersome. We didn’t need complete knowledge of motion to create transportation mechanisms. Yes, the better knowledge we have, the better invention we are going to do. This is one of the beauty of our universe.
A nail can be driven into wall expertly using hammer and better still using a driller. But even a stone can be used to do it. Only the case will be that we will find it cumbersome and we will not find that finesse as a driller will provide.
Is there a passing percentage in science to do a job? Students need minimum 33% to pass an exam. Do we need a minimum passing knowledge in physics to do the thing to at least a workable condition? Can we mathematically derive such equations? Only time will tell when we will be able to answer such questions.