Topic Cluster

Classical Mechanics

Forces, energy, momentum and motion — the core of classical physics: Newton’s laws, work and energy, collisions, rotation and everyday mechanics.

Classical Mechanics

What Is Elastic Potential Energy?

Elastic potential energy is the energy stored when a spring or elastic object is stretched or compressed, given by EPE = ½kx². This guide explains the formula, why energy grows with the square of the stretch, and how to use it, with worked examples.

13 min read

Classical Mechanics

What Is Torque in Physics?

Torque is the turning effect of a force, given by τ = rF sinθ. This guide explains the formula, why the angle matters, real-world examples and worked problems.

13 min read

Classical Mechanics

Weight vs Mass: What’s the Difference?

Mass is the amount of matter in an object (measured in kilograms); weight is the force of gravity on it (measured in newtons). This guide explains the difference, the W = mg formula, and how your weight changes across the solar system while your mass stays the same.

12 min read

Classical Mechanics

What Is Power in Physics?

Power in physics is the rate at which work is done, P = W/t = Fv, measured in watts. This guide explains the formula, average vs instantaneous power, real-world examples, and seven worked problems.

11 min read

Classical Mechanics

Potential Energy: Definition, Types & Formula

Potential energy is stored energy an object has due to its position or configuration. Learn the PE = mgh formula, the main types, real-world examples and step-by-step worked problems.

12 min read

Classical Mechanics

What Is Gravitational Potential Energy?

Gravitational potential energy is the energy an object stores because of its height. This guide explains the PE = mgh formula, works through eight problems, clears up common misconceptions, and includes an interactive energy-conservation lab.

12 min read

Classical Mechanics

What Is Hooke’s Law?

Hooke's Law (F = kx) explains how springs stretch in proportion to force. A clear guide to the spring constant, elastic potential energy, the elastic limit and 8 worked examples.

14 min read

Classical Mechanics

What Is Centripetal Force?

Centripetal force is the inward force that keeps objects moving in a circle. This guide explains the F=mv²/r formula, real-world examples, and the difference between centripetal and centrifugal force.

13 min read

Classical Mechanics

What Is Tension Force?

Tension force is the pulling force in a rope, string or cable. Learn the formula T = m(g + a), see seven worked examples, clear up common myths, and try the interactive lab.

12 min read

Classical Mechanics

What Is Simple Harmonic Motion?

A clear, exam-ready guide to simple harmonic motion — what it is, the key formulas, real-world examples, seven worked problems, and an interactive lab showing how displacement, velocity, and acceleration change over time.

13 min read

Classical Mechanics

What Are Momentum and Impulse?

Momentum and impulse explained from scratch: what they are, the p = mv and J = FΔt formulas, conservation of momentum, elastic vs inelastic collisions, and eight fully worked examples.

13 min read

Classical Mechanics

What Is Conservation of Momentum?

Conservation of momentum explained simply: the formula, elastic and inelastic collisions, eight worked examples, common misconceptions, and an interactive collision lab for students.

13 min read

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