# Things You Need To Know in Physics

## Physics!

Physics is a natural science which involves a study of matter and its motion through space and time, along with related concepts such as energy and force. It is considered as one of the complicated branches of natural science that is why physics tuition Singapore and secondary tuition Singapore is quite high. Below are some lessons about Physics that every student should know, learn, and understand.

## 1. Classical Mechanics

Widely known as the Newtonian mechanics, classical mechanics is one of the two sub-major fields of mechanics together with the quantum mechanics. Under the equilibrium of the bodies or forces, classical mechanics deal with its motions. It is a study of physical laws that describes different motions of the bodies under several systems of forces. In classical mechanics, the central concepts include mass, force, and motion. This sub-major field of mechanics’ foundation is the three Newton’s laws of motion.

## 2. Waves

Accompanied by a transfer of energy that travels through mass or space, a wave in physics is an oscillation. It has two major types which include electromagnetic waves and mechanical waves. The electromagnetic waves consist of electrical and magnetic fields periodic oscillations that are generated by charged particles and do not require a medium. While the mechanical waves needs a medium to propagate and its substance is deformed. Some examples of mechanical waves include waves on strings, acoustic waves, water waves, seismic waves, and shock waves. While the electromagnetic waves have different types of radiation which include infrared, ultraviolet, X-rays, visible light, radio waves, and microwaves.

## 3. Harmonic Oscillator

The harmonic oscillator is part of the classical mechanics that is defined as a system that experiences a restoring force (F) that is proportional to the displacement of x and where k is a positive constant. The motion in harmonic oscillator is periodic while the restoring force is oppositely directed and proportional to the displacement. The key concepts of harmonic oscillator include frequency, complex exponential, liner, non-linear, and amplitude.

## 4. Electromagnetism

One of the branches of physics, electromagnetism is a study of electromagnetic force which is a type of physical interaction between electrically charged particles. The two main aspects of electromagnetism are electricity and magnetism. Either in motion or at rest, electric forces are produced by electric charges. While the magnetic forces act solely on charges in motion and are only produced by moving charges. Usually, the electromagnetic force shows electromagnetic fields which include magnetic fields, light, and electric fields. The central concepts of electromagnetism are proton, electron, charge, electric field, and magnetic field.

## 5. Special Relativity

Regarding the relationship between time and space, special relativity is the generally accepted physical theory which is also known as the special theory of relativity. This theory is based on two postulates, the first one is that the laws of physics are invariant in all inertial systems; and the second one states that the speed of light in a vacuum is the same, regardless of the motion of the source of light, for all observers.