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Physics learning and practice
Explore motion, forces, energy, electricity, waves and modern physics. Connect quantities with their units, change an example and practise applying a physical relationship.
12 topics · 63 skills · Free plan available
Start learning PhysicsElectricity
Charge on the move: current, voltage and resistance, Ohm's law, and how a circuit works.
- Electric Charge
- Electric Current
- Electrical Circuits
- Ohm’s Law
- Voltage and Resistance
Forces
What makes things move or stay put — the kinds of force, net force, Newton's three laws, pressure, momentum and moments.
- Moments
- Momentum
- Net Force
- Newton’s First Law
- Newton’s Second Law
- Newton’s Third Law
- Pressure
- Types of Forces
Light & Optics
Light and optics — what light is, reflection and refraction, lenses and mirrors, and the instruments built from them.
- Lenses and Mirrors
- Nature of Light
- Optical Instruments
- Reflection of Light
- Refraction of Light
Magnetism
Magnetic fields and poles, the link between electricity and magnetism, magnetic force, and what it is used for.
- Applications of Magnetism
- Electromagnetism
- Magnetic Fields
- Magnetic Force
- Magnetic Poles
Modern Physics
Where classical physics runs out — the photoelectric effect, wave-particle duality, atomic models, and what came of them.
- Applications of Modern Physics
- Atomic Models
- Limits of Classical Physics
- Photoelectric Effect
- Wave-Particle Duality
Motion & Kinematics
Describing movement: distance and displacement, speed and velocity, acceleration, and reading a motion graph.
- Acceleration
- Distance and Displacement
- Motion Graphs
- Speed and Velocity
- Types of Motion
Nuclear Physics
Inside the nucleus: radioactivity, fission and fusion, and the uses nuclear physics is put to.
- Atomic Nucleus
- Nuclear Applications
- Nuclear Fission
- Nuclear Fusion
- Radioactivity
Quantum Basics
The quantum idea — energy in quanta, the uncertainty principle, quantum states, and where the theory is applied.
- Energy Quanta
- Quantum Applications
- Quantum Concept
- Quantum States
- Uncertainty Principle
Relativity
Motion seen from different frames: the speed of light, time dilation, length contraction, and mass-energy equivalence.
- Frames of Reference
- Length Contraction
- Mass-Energy Equivalence
- Speed of Light
- Time Dilation
Sound
Sound as a wave: frequency and pitch, amplitude and loudness, how fast it travels, and echoes.
- Amplitude and Loudness
- Echoes and Reflection of Sound
- Frequency and Pitch
- Nature of Sound Waves
- Speed of Sound
Waves
How waves behave — the types, their properties, wave speed, reflection and refraction, and interference.
- Reflection and Refraction
- Types of Waves
- Wave Interference
- Wave Properties
- Wave Speed
Work & Energy
Work, energy and power: kinetic and potential energy, and why the total is conserved.
- Conservation of Energy
- Kinetic Energy
- Potential Energy
- Power
- Work
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