How is the meaning of theory in science different from the everyday use of the term

In everyday use, theory is used to mean a guess or idea about how something works. In science we would call that a hypothesis not a theory. A scientific theory is a well sustained proposal or explanation based on facts that have been repeatedly confirmed through experiments and observations. To sum up, a theory in the real world is basically a guess, and a theory in the science world is a well though out plan that has been tested and a more intact thought.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on