Physics Zen

Hong Kong

HKDSE Physics

Exam-style practice for HKDSE Physics: the compulsory part (heat and gases, force and motion, wave motion, electricity and magnetism, radioactivity and nuclear energy) and the Atomic World elective. Focused practice, not a full mock paper.

44 skills · g = 9.81 m/s²

Conventions

  • The path follows the compulsory part and the Atomic World elective of the HKEAA Physics Curriculum and Assessment Guide (S4-6).
  • This is focused practice, not a mock paper. Sound (echoes and decibels), heat transfer processes, radiation detection, domestic electricity safety, written explanations and the School-based Assessment are not included. Of the other Paper 2 electives, Energy and Use of Energy has one wind-power item; Astronomy and Space Science and Medical Physics are not served.
  • Problems use g = 9.81 m/s², the value in the HKEAA list of data, formulae and relationships.
  • The in-app order follows the teaching sequence, not the curriculum's topic numbering.
  • Physics Zen is independent exam-style practice, not official exam material, and is not affiliated with the HKEAA.

Units on this path

Heat and Gases

  • Specific Heat: Find the heat a temperature change needs, and the final temperature of a mixture
  • Phase Changes: Add up the heat for melting and boiling alongside the heat for warming
  • Gas Laws: Apply the ideal gas law and the combined gas law, always in kelvin

Force and Motion

  • Uniform Motion: Relate distance, speed, and time at constant velocity, and convert km/h to m/s
  • Uniform Acceleration: Use the constant-acceleration equations and read velocity-time graphs
  • Free Fall: Drop and throw objects under gravity: fall time, impact speed, maximum height
  • Projectile Motion: Split a launch into horizontal and vertical motion to find flight time and range
  • Launch at an Angle: Resolve a launch velocity into components and find the time to the top, the greatest height and the range
  • Newton's Laws: Apply F = ma, add forces along a line, and tell mass from weight
  • Friction: Find the friction force from the normal force and the net force on a sliding object
  • Inclined Plane: Resolve weight along a slope and find the acceleration with and without friction
  • Work: Find the work a force does, at an angle to the motion and against friction
  • Kinetic & Potential Energy: Compute kinetic and gravitational potential energy, and work back to speed or height
  • Conservation of Energy: Trade height for speed on a frictionless path, and account for what friction takes
  • Power: Relate work, time, force and speed through power, measured in watts
  • Momentum & Impulse: Find momentum and impulse, and the average force behind a change of motion
  • Conservation of Momentum: Apply momentum conservation to collisions that stick together and to recoil
  • Elastic Collisions: Handle collisions that also conserve kinetic energy, starting with equal masses
  • Uniform Circular Motion: Link period, frequency and speed on a circle, and find centripetal acceleration
  • Centripetal Force: Find the force that holds an object on a circular path, from tension to friction
  • Gravitation: Use the inverse square law for surface gravity, orbital speed and orbital period
  • Torque & Rotational Inertia: Find the turning effect of a force and the inertia a body has about an axis

Wave Motion

Electricity and Magnetism

  • Charge & Coulomb's Law: Find the force between two charges and count the electrons behind a charge
  • Electric Field: Get the field from a force on a test charge and from a source charge at a distance
  • Ohm's Law & Resistance: Relate voltage, current and resistance, and find resistance from a wire's dimensions
  • Series & Parallel: Combine resistors in series and in parallel, and split the current between branches
  • Electrical Power: Find power three ways, and the energy in kilowatt hours a device uses
  • Magnetic Field of a Current: Find the field around a straight wire and inside a solenoid, and add the fields of two wires
  • Magnetic Force: Find the force on a moving charge and on a current-carrying wire in a field
  • Electromagnetic Induction: Use Faraday's law to get the EMF a changing flux induces in a coil
  • AC & Transformers: Use rms values and transformer ratios to calculate voltage changes and explain high-voltage transmission

Radioactivity and Nuclear Energy

  • Radioactive Decay: Halve an activity across half-lives and name the nuclide a decay leaves behind
  • Mass-Energy: Convert a mass defect into energy and find the binding energy per nucleon

Atomic World (elective)

  • Photons & Photoelectric Effect: Get a photon's energy from its wavelength and the electrons it can knock loose
  • Matter Waves & X-rays: Find the de Broglie wavelength of a particle, the cutoff of an X-ray tube and the spacing from a Bragg reflection
  • Energy Levels: Find the photon an atomic transition emits, in electronvolts and in nanometres

How Physics Zen helps

The HKDSE path drills 44 skills behind Paper 1 and the Atomic World elective: motion graphs and projectiles, Newton's laws and momentum, moments, specific heat capacity, latent heat and the general gas law, wave graphs and interference, lenses and gratings, e.m.f. and internal resistance, the fields of a wire and a solenoid, induction and power transmission, half-life, and the photoelectric equation. Seven original HKDSE-style items mix in at the harder levels, and every skill generates fresh values with instant checking and a worked solution.

Topics on this path

Guides

How to Prepare for HKDSE Physics: A Plan for Paper 1 and Paper 2

HKDSE Physics revision mapped to the HKEAA syllabus: paper format, topic weight by lesson time, 44 skills to drill, what the app skips and a plan to April 2027.

Physics Zen is an independent practice tool. It is not affiliated with College Board, the IQB, the French Ministry of Education or any other exam board.

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