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Physics Revision

Forces, energy & electricity — part of Science on KODO.

AQA Edexcel OCR Gateway OCR 21st Century WJEC

Physics is a core area of KS3 Science in the national curriculum. It covers essential concepts that build the foundation for GCSE study and beyond.

This topic includes subtopics such as Forces and motion, Energy stores and transfers, Electricity and circuits, Light, sound and waves and more. Each area is tested with multiple-choice questions that include detailed explanations to deepen your understanding.

Quick Reference

Speed formulaspeed = distance ÷ time
Ohm's LawV = I × R
Weight formulaweight = mass × gravity (W = mg)
Gravity on Earth≈ 10 N/kg (or 9.8 N/kg)

Key Definitions

Force
A push or pull that can change an object's speed, direction or shape. Measured in Newtons (N).
Speed
Distance travelled per unit of time. Speed = distance ÷ time.
Energy
The capacity to do work. Measured in Joules (J). Cannot be created or destroyed — only transferred.
Current
The flow of electrical charge around a circuit. Measured in Amps (A).
Voltage
The push that drives current around a circuit. Measured in Volts (V).

What You'll Cover

Forces and motion
Energy stores and transfers
Electricity and circuits
Light, sound and waves
Space and Earth
Energy (types and transfers)
Light and sound
Space

Test Yourself — Physics

Try 3 quick questions. No account needed.

Quick Quiz

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Memory Tricks & Mnemonics

"Speed = Distance ÷ Time" — the "DST triangle"

Cover what you want to find: D/S×T.

"V = I × R" (Ohm's Law) — "Very Important Rule"

Calculate voltage, current or resistance.

"Kinetic Starts with K for moving, Potential for stored"

Distinguish kinetic and potential energy.

Frequently Asked Questions

What is Force in Science?+
A push or pull that can change an object's speed, direction or shape. Measured in Newtons (N).
What is Speed in Science?+
Distance travelled per unit of time. Speed = distance ÷ time.
What is Energy in Science?+
The capacity to do work. Measured in Joules (J). Cannot be created or destroyed — only transferred.
What is Current in Science?+
The flow of electrical charge around a circuit. Measured in Amps (A).
What does Physics cover in KS3 Science?+
Physics in KS3 Science covers Forces and motion, Energy stores and transfers, Electricity and circuits, Light, sound and waves, Space and Earth, Energy (types and transfers), Light and sound, Space. Forces, energy & electricity.
What is the best way to revise Physics?+
Test yourself rather than re-reading notes. Do a short Physics quiz, read the explanation for every answer you get wrong, then come back to those questions a few days later. KODO does this automatically with spaced repetition, and you can turn any topic into printable flash cards.
Is Physics revision on KODO free?+
Yes. KODO is free for everyone until Friday 18 December 2026, with unlimited quizzes on Physics and every other topic. After that there is still a free plan with daily quizzes.

Start practising Physics now

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