Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experimental tools to probe these phenomena. 

The advancement of science generally depends on the interplay between experimental studies and theory. In some cases, theoretical physics adheres to standards of mathematical rigor while giving little weight to experiments and observations. For example, while developing special relativity, Albert Einstein was concerned with the Lorentz transformation which left Maxwell's equations invariant, but was apparently uninterested in the Michelson–Morley experiment on Earth's drift through a luminiferous ether. Conversely, Einstein was awarded the Nobel Prize for explaining the photoelectric effect, previously an experimental result lacking a theoretical formulation. 

A physical theory is a model of physical events. It is judged by the extent to which its predictions agree with empirical observations. The quality of a physical theory is also judged on its ability to make new predictions which can be verified by new observations. A physical theory differs from a mathematical theorem in that while both are based on some form of axioms, judgment of mathematical applicability is not based on agreement with any experimental results. A physical theory similarly differs from a mathematical theory, in the sense that the word "theory" has a different meaning in mathematical terms. A physical theory involves one or more relationships between various measurable quantities. Archimedes realized that a ship floats by displacing its mass of water, Pythagoras understood the relation between the length of a vibrating string and the musical tone it produces. Other examples include entropy as a measure of the uncertainty regarding the positions and motions of unseen particles and the quantum mechanical idea that (action and) energy are not continuously variable. QUESTIONS:

Q1:
1. What does theoretical physics tell us more about?
2. What is illuminated by theoretical physics?
3. What does theoretical physics serve as an explanation for?
Q2:
1. Can theoretical physics predict things?
2. Is theoretical physics used to make predictions?
3. Can the future be imagined by theoretical physics?
Q3:
1. What is used by theoretical physics?
2. How does theoretical physics make calculations?
3. What is employed by theoretical physics?
Q4:
1. What branch of physics does theoretical physics differ from?
2. What's the other main branch of physics, apart from theoretical?
3. What kind of physics in theoretical physics contrasted with?
Q5:
1. What did Einstein create?
2. What was developed by Einstein?
3. What was Einstein able to come up with?
Q6:
1. What did Einstein win for his explanation of the photoelectric effect?
2. What did Einstein's explanation of the photoelectric effect win him?
3. What was Einstein awarded for explaining the photoelectric effect?
Q7:
1. What are the components of a physical theory?
2. What is meant by a physical theory?
3. How can a physical theory be defined?
Q8:
1. How do boats stay above water?
2. What allows a boat to stay afloat?
3. How do boats manage not to sink?
Q9:
1. Who first figured out how boats stay afloat?
2. Who first understood how boats stay above water?
3. Who realized the mechanism by which boats manage not to sink?
Q10:
1. Did Archimedes also study musical tone?
2. Were musical tones also an area of Archimedes study?
3. Did the theories of Archimedes also concern musical tone?
