Physics: every topic explained
30 short explanations for Physics, one per syllabus topic: the idea, the rules, the common mistake and a worked example. Each one links to our notes and a free test on that topic.
Measurements
Vectors and equilibrium
- Vectors: representation, addition and rectangular components
- Product of two vectors
- Torque and equilibrium
Motion and force
- Displacement, velocity, acceleration and motion graphs
- Newton's laws, momentum and collisions
- Projectile motion
Work and energy
- Work, power and conservative field
- Work-energy principle and conservation of energy
- Absolute potential energy, escape velocity and energy sources
Circular motion
- Angular motion and centripetal force
- Moment of inertia, angular momentum and rotational kinetic energy
- Artificial satellites and weightlessness
Fluid dynamics
Oscillations
- Simple harmonic motion and the reference circle
- Mass-spring system, simple pendulum and energy in SHM
- Free and forced oscillations, resonance and damping
Waves
- Progressive waves and the speed of sound
- Superposition, interference, beats and Doppler effect
- Stationary waves in strings and air columns
Physical optics
Optical instruments
Heat and thermodynamics
- Kinetic theory of gases
- Internal energy and the first law of thermodynamics
- Second law, heat engines and entropy
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