Complete collection of key terms, concepts, formulas, and laws from all 9 chapters
This comprehensive collection contains all key definitions, terms, formulas, and laws from the Class 9 Physics syllabus according to the Punjab Textbook Board. Each chapter is organized systematically with clear explanations and examples.
The branch of science that deals with the study of matter, energy, and their interactions.
A property of a material or system that can be quantified by measurement (e.g., length, mass, time).
Fundamental quantities that cannot be defined in terms of other physical quantities (length, mass, time, electric current, temperature, amount of substance, luminous intensity).
The study of motion of objects without considering the forces that cause the motion.
The rate of change of velocity with time. Unit: m/s²
A push or pull that changes or tends to change the state of rest or uniform motion of a body.
A body continues its state of rest or uniform motion unless acted upon by an external unbalanced force.
The turning effect of a force about an axis of rotation. \( \tau = F \times d \)
A point where the whole mass of the body is assumed to be concentrated.
Product of force and displacement in the direction of force. \( W = F \times d \times \cosθ \)
Capacity to do work. Unit: joule (J)
Mass per unit volume. \( \rho = \frac{m}{V} \)
\( F = kx \)
A measure of the average kinetic energy of the particles in a substance.
The increase in size of a substance due to increase in temperature.
The region around a magnet where its magnetic force can be detected.
A temporary magnet created by passing electric current through a coil.
A systematic approach to research consisting of observation, hypothesis, experimentation, and conclusion.
The application of scientific knowledge for practical purposes.