Optics
Light allows us to see objects around us. Without light, vision is impossible.Optics is the branch of physics that deals with the behaviour and properties of light. It explains how light travels, how it reflects and bends, how images are formed, and how the human eye works.This chapter connects physics with daily experiences like: Rectilinear Propagation of […]
Properties of Matter
Everything around us has a shape, size, and presence. But physics does not stop at what we see. It asks deeper questions.Why does a stone sink while wood floats? Why do gases spread in all directions? Why does weight change but mass does not?All these questions are answered by understanding the properties of matter. Physical Properties and States […]
Heat
Heat is something we experience every day. We feel heat from the Sun, from fire, from an iron, and even from our own body.But in physics, heat is not just a feeling. It is a form of energy that explains: Understanding heat helps us understand many natural and daily-life processes. Effects of Heat When heat is supplied […]
Sound
Sound is a part of our daily life. We speak, listen, enjoy music, and hear warning signals because of sound.In physics, sound is not just something we hear. It is a form of energy produced by vibrations and travels as a wave through a medium.Understanding sound helps us explain: Sound Waves Production of Sound Sound is produced […]
Lesson Loading Soon
Energy
Energy is one of the most fundamental ideas in physics. Every movement in nature, every activity of a machine, and every action of a living being requires energy. From a child walking to a bicycle moving, from a fan rotating to a mobile phone charging, all processes need energy in some form. Energy helps us […]
Rest and Motion
An object is said to be at rest if its position does not change with respect to its surroundings with the passage of time.An object is said to be in motion if its position changes with respect to its surroundings with the passage of time.Both rest and motion are not absolute. They depend on the […]
Force
Force is defined as a push or a pull that can change the state of rest or motion of an object, or change its shape. This definition focuses on the observable effects of force rather than its internal nature. Since force itself cannot be seen, its presence is always inferred from the changes it produces […]
Newton’s Laws of Motion
The Laws of Motion were formulated by Sir Isaac Newton to describe the relationship between force and motion. These laws apply to objects moving at ordinary speeds and sizes and are valid in everyday situations. There are three laws of motion. Each law explains a different aspect of motion, but all three laws work together […]
Friction
Friction is defined as the force that opposes the relative motion or the tendency of motion between two surfaces in contact. This opposition always acts along the surface of contact and in a direction opposite to the motion or attempted motion. Friction does not act in the absence of contact. If two objects are not […]