They were intended for the mathematical/physical branch of the Danish educationnal 9-12 grade highschool (Gymnasium).

Until 1988 Mathematics and Physics were teached on a fairly high theoretical level in Denmark. This was possible because the students mathematical skills at that time were vastly better than today.

After 1988, the way of teaching physics changed, the traditional theoretical level with proofs, derivations and rigorous expanations were dropped, and replaced by teaching how physics and mathematics could be applied in daily life society.

By the reform in 2005, the theoretical aspect almost disappered completely, and elemmentary mathematical skills were discarded
in favor of operating mathematical computer programs. The education has turned from theoretical to lexical.

A development in the educational systems towards the ideology of social constructivism, which I sense is more or less shared
by most of the Western world.(But not in Asia)

For this reason The textbooks "Elementary Physics", was completely absent in educational system in the period 1988 - 2008. for the simple reason, that the students were unable to understand it (especially the mathematics), but since then it has had a revival, but now as internet pages, together with the many other articles in my homepage. www.olewitthansen.dk .

The reason for the renewed interest for a 40 years old textbook is that textbooks on physics presented in this manner simply do not exist any longer, neither as textbooks nor as internet pages material, were you get a rigorous theoretical explanation of physics and mathematics in a level, which nowadays is at university undergraduate level. If you should ask for a comparison for the level and the conceptual chronology in the books, you might choose Young and Freedmann: University Physics. (But my books were actually written some 15 years earlier).

- Physical Quantities and units. (Elementary Physics 1) Chapter 1 of the textbook: Elementary Physics 1
- Kinematics. (Elementary Physics 1) Chapter 2 of the textbook: Elementary Physics 1
- Vectors in physics. (Elementary Physics 1) Chapter 2 of the textbook: Elementary Physics 1
- Newton's laws. Exemplified. (Elementary Physics 1) Chapter 3 of the textbook: Elementary Physics 1
- Mechanical work and energy. (Elementary Physics 1) Chapter 4 of the textbook: Elementary Physics 1
- Pressure. Pressure in liquids. Archimedes law. (Elementary Physics 1): Chapter 5 of the textbook: Elementary Physics 1
- Conservation of momentum in collisions.(Elementary Physics 1) Chapter 6 of the textbook: Elementary Physics 1
- Thermodynamics and Calorimetry. (Elementary Physics 1) Chapter 7+9 of the textbook: Elementary Physics 1
- The laws of ideal gases. (Elementary Physics 1) Chapter 8 of the textbook: Elementary Physics 1
- The kinetic molecular theory. (Elementary Physics 1) Chapter 10 of the textbook: Elementary Physics 1
- Electricity. Electrical currents, potentials and forces. Ohms laws and Kirchhoff's laws.(Elementary Physics 1) Chapter 11 of the textbook: Elementary Physics 1

- Kinematics, with an introduction to calculus. (Elementary Physics 2) Chapter 1 of the textbook Elementary Physics 2
- Moving in two dimensions. Oblique throw, uniform circular motion, etc. (Elementary Physics 2) Chapter 2 of the textbook Elementary Physics 2
- The laws of Kepler. Newton's law of gravitation. (Elementary Physics 2) Chapter III of the textbook Elementary Physics 2
- Harmonic oscillations. (Elementary Physics 2) Chapter IV of the textbook Elementary Physics 2
- The propagation of waves. The equation of harmonic waves. Interference. Sound waves. Light waves. The law of refraction. (Elementary Physics 2) Chapter V of the textbook Elementary Physics 2
- Newtonian Mechanics: Dynamics. (Elementary Physics 2) Chapter VI of the textbook Elementary Physics 2
- Dynamics of particle systems. Conservation of momentum. Lauching of rockets (Elementary Physics 2) Chapter VII of the textbook Elementary Physics 2
- Theory of Rotation. Conservation of angular momentum. (Elementary Physics 2) Chapter VIII+IX of the textbook Elementary Physics 2
- The Special Theory of Relativity. (Elementary Physics 2) Chapter X of the textbook Elementary Physics 2

- Electrostatics. (Elementary Physics 3) Electric field. Electric potential. Capacitors.
- Magnetism. Magnetostatics.(Elementary Physics 3) Magnetic field, Biot and Savart’s law, Laplace law, Ampere’s law, Paramagnetism.
- The motion of charged particles in electric and magnetic fields.(Elementary Physics 3) Millican’s experiment, The Lorentz force, Determination of the masses of atoms.
- The laws of induction. (Elementary Physics 3) Faradays law, eddy currents, inductance, R - L circuits.
- Alternating currents.(Elementary Physics 3) Alternating currents and voltages. Resistances, inductors and capacitors. Impedances. Series and parallel connections.
- Maxwell's equations. Electromagnetic waves.(Elementary Physics 3) LC-circuits, Maxwell's equation, and electromagnetic waves
- The quantum physics of atoms.(Elementary Physics 3) Rutherford's and Bohr's atom models. The hydrogen atom. The periodic system.
- Quantum particle-wave duality.(Elementary Physics 3) The X-ray spectrum, Compton-effect. The de Broglie assumption. The uncertainty relation by Heisenberg.
- The Physics of Radioactivity.(Elementary Physics 3) The law of radioactive decay. Transformations of the atomic nucleus. Energy considerations on radioactive decays.
- Nuclear reactions. Rutherford’s formula. (Elementary Physics 3) Conservation laws for nuclear reactions. The discovery of the neutron. Artificial radioactivity. Cross sections for scattering.Rutherford’s formula
- The structure of the nucleus. (Elementary Physics 3) Binding energies and mass-defect. Stability and mass formula.
- Nuclear power. Fission. Reactor physics (Elementary Physics 3)
- The physics of elementary particles(Elementary Physics 3)
- Astrophysics. The life and death of stars. Neutron stars and black holes (Elementary Physics 3)