Learn Physics

Short concept articles with links to try the ideas in interactive simulations.

• Projectile Motion Explained

  Projectile motion combines independent horizontal motion with vertical free fall. Understanding this split makes predicting range, time of flight, and trajectory straightforward.

• Ohm's Law and DC Circuits

  Ohm's law relates voltage, current, and resistance: V = IR. It is the foundation for analyzing simple and combined resistor circuits.

• The Photoelectric Effect

  Light can eject electrons from a metal surface only when each photon carries enough energy. This supports the quantum photon model of light.

• Standing Waves on a String

  When waves reflect and interfere, stable patterns form with nodes and antinodes. Standing waves are central to musical instruments and resonance.

• Buoyancy and Archimedes' Principle

  An object in a fluid experiences an upward buoyant force equal to the weight of displaced fluid. This explains floating, sinking, and apparent weight loss.