The standard model of particle physics is a mathematical model that describes electromagnetism, the strong and weak nuclear forces, and the Higgs mechanism.

The standard model of particle physics is a mathematical model that describes electromagnetism, the strong and weak nuclear forces, and the Higgs mechanism.

Quantum chromodynamics is a theory of the strong nuclear force. The force that holds quarks together to form protons and neutrons, among other things.

Quantum electrodynamics is the modern theory of electricity, magnetism, and light. The use of Feynman diagrams to describe particle interactions started here.

Frequently used equations in physics. Appropriate for secondary school students and higher. Mostly algebra based, some trig, some calculus, some fancy calculus.

There are three one-dimensional equations of motion for constant acceleration: velocity-time, displacement-time, and velocity-displacement.

Methods for solving problems in orbital mechanics using Newton's law of universal gravitation and the second law of motion are discussed.

Mass is a quantity that measures resistance to changes in velocity. Moment of inertia is a similar quantity for resistance to changes in rotational velocity.

The standard model is the crowning achievement of particle physics, but no one would say that it is complete. What might a 'theory of everything' look like?

We actually feel our weight through the normal force when we sit, stand, or lie. In an accelerating reference frame, our normal force does not equal our weight.