Physical Phenomena

Short video lessons on motion and forces, waves, light, mirrors and lenses, electric fields and circuits.

40 lessons
Lesson 1 free
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All 40 lessons

Taught with short videos.

Lesson 1Free
Uniform & Rectilinear

Uniform rectilinear motion, velocity, and the relations between distance-time and velocity-time graphs.
Lesson 2
Acceleration / Deceleration

Characteristics of acceleration and deceleration, the role of forces, and velocity-time and distance-time graphs.
Lesson 3
Drop the Ball

Free fall, gravitational acceleration, and the key relations of vertical throwing.
Lesson 4
The Big Shot

Horizontal throwing, the effect of gravity, addition of velocity vectors, and the parabolic trajectory.
Lesson 5
Round and Round

Circular motion, circumferential speed and angular velocity, period, frequency, and centripetal and tangential acceleration.
Lesson 6
Swirl and Spin

Angular momentum, moment of inertia, angular velocity, and the law of conservation of angular momentum in rotational motion.
Lesson 7
Good Vibes

Oscillatory motion and its characteristics: amplitude, period, frequency, and the relationship between harmonic oscillation and uniform circular motion.
Lesson 8
Static and Kinetic

Static and kinetic friction, the magnitude of frictional force, its uses, and its heat-generating effect.
Lesson 9
Resistance of Media

Resistance of media, factors affecting its magnitude, and its role in assisting and hindering motion.
Lesson 10
Make Lifting Easier

One-sided and two-sided levers, the wheel and axle, torque, and work performed using simple machines.
Lesson 11
A Pulley that Won’t Bully

Fixed and movable pulleys, and the operation and force relations of compound and Archimedean pulley systems.
Lesson 12
Up the Slope

Inclined planes and wedges, the relations between force and distance, and the effect of friction.
Lesson 13
Let's Collide

Elastic and inelastic collisions, conservation of momentum, and the role of energy and deformation.
Lesson 14
Riding Waves

Mechanical waves, wavelength, amplitude, period, frequency, propagation velocity, and the characteristics of wavefronts.
Lesson 15
Refraction / Reflection

Wave refraction and reflection, refractive index, total internal reflection, and the phenomenon of light refraction.
Lesson 16
Standing Waves

Formation of standing waves, interference, and the role of nodes, antinodes, and resonance.
Lesson 17
Mind the Gap!

Diffraction of waves, the Huygens-Fresnel principle, interference, and the fundamentals of Fresnel lens operation.
Lesson 18
Polarisation

Polarisation, the vibration plane of transverse waves, and the operation of polarisers and polarising filters.
Lesson 19
Mirror, Mirror on the Wall…

Image formation by plane and convex mirrors, light reflection, and characteristic optical paths.
Lesson 20
In the Concave Mirror

Image formation by concave spherical mirrors, focal point, most important optical paths, and the effect of object distance.
Lesson 21
Let's Refract the Light

The law of refraction, operation of a plane-parallel plate and prism, and dispersion of light.
Lesson 22
Collecting Light

Operation of converging lenses, typical optical paths, focal length, and image formation depending on object position.
Lesson 23
Diverging Lenses

Construction, focal point, image formation, and applications of concave diverging lenses.
Lesson 24
Distant Examinations

Characteristics of telescopes, increasing the angle of view, and applications of refracting and reflecting telescopes.
Lesson 25
The Electric Field

Electric field, electric field strength, field lines, test charge, and the principle of superposition.
Lesson 26
Work and Voltage

Work done by the electric field, the concepts of voltage and potential, and their relation to electric field strength.
Lesson 27
Storage for the Charges

Types and construction of capacitors, their capacitance and charge, and the concept of permittivity.
Lesson 28
Charges in Motion

Electric current, movement of charge carriers, current, current direction, and the different physical effects of electric current.
Lesson 29
Electrolysis

Conduction in electrolytes, electrolysis, electrolytic dissociation, and Faraday's laws of electrolysis.
Lesson 30
Current in Gas

Electric current in gases, ionisation, electrical discharges, and the formation of lightning and thunder.
Lesson 31
Circuit Made Simple

Components of a simple circuit, voltage and current measurement, electrical resistance, and Ohm's law.
Lesson 32
Obstacle for the Current

Resistance of conductors depending on length, cross-section, resistivity, and temperature.
Lesson 33
With Several Loads

Series and parallel connection of loads, current and voltage relationships, and equivalent resistance.
Lesson 34
Short-circuit vs Open-circuit

Internal resistance and terminal voltage of sources, open circuit, short circuit, and the dangers of short-circuit current.
Lesson 35
The Conductor as a Magnet

Magnetic field of a current-carrying conductor, magnetic induction, right-hand rule, coils, and ferromagnetic materials.
Lesson 36
Between the Ends

Motional electromotive force, Lorentz force, induced voltage, Lenz's law, and the operation of an electric generator.
Lesson 37
Standing Still

Transformer emf, self-induction, inductance, and voltage produced by a changing magnetic field.
Lesson 38
Current Back and Forth

Alternating current and voltage, instantaneous and RMS values, frequency, and sinusoidal waveform.
Lesson 39
Three in Series

Series RLC circuit, ohmic resistance, inductive and capacitive reactance, impedance, phase difference, and resonant frequency.
Lesson 40
Pass on the Energy

Electromagnetic oscillations in an LC circuit, energy transformation, natural frequency, damping, and Thomson's formula.