Middle School Physics: Free Course

About this course

Build a foundation in forces, motion, energy and waves with this free middle-school physics course from Khan Academy. Every recording in the eighteen-video source sequence is included, from the introduction and basic motion concepts to electromagnetic waves and matter. The lessons connect scientific terms with manageable explanations.

Course at a glance

What you’ll learn

• Distinguish speed, velocity, acceleration and reference-frame concepts.
• Follow the source explanations of forces and Newton’s laws.
• Connect kinetic and potential energy with conservation examples.
• Explore wave properties, sound and the electromagnetic-spectrum lessons.

Skills you’ll gain

• Physics foundations
• Motion concepts
• Forces
• Energy reasoning
• Wave properties
• Scientific explanation

Course Overview

The introduction leads into motion and reference frames before the course turns to forces. The three Newton-law recordings build a framework for the later gravitational, electric and magnetic-force lessons. Kinetic energy, potential energy and conservation then connect motion with energy reasoning. The final section addresses wave properties, sound, the electromagnetic spectrum and interactions with matter. All eighteen source videos are retained. This is the recorded middle-school teaching sequence, with independent practice encouraged; platform exercises, simulations and formal classroom assessment are separate. The useful study habit is to connect a term with the question it answers rather than treating the course as a list of formulas.

How to study the course

• Study motion and reference frames first. Describe a simple situation in words before choosing the scientific term that fits it.
• Follow forces and the Newton-law recordings, then the energy section. Keep force reasoning distinct from an energy description even when both concern the same example.
• Complete waves, sound and the electromagnetic topics. Compare the properties being discussed and explain one connection with a familiar situation.

Use the searchable classroom lesson list to revisit a specific explanation. Pause after a useful demonstration, reproduce a small example and explain the result in your own words. Keep a short note of what worked, what changed and what you still need to understand before moving on.

Who is this for?

This course suits middle-school learners, students preparing for more advanced physics and adults refreshing foundational science. The short recordings can also support an educator’s lesson without replacing a broader classroom program.

Before you start

Basic arithmetic and comfortable English reading are helpful. Keep a notebook for small sketches and explanations. Free video access does not include supervised experiments, platform mastery tests, teacher feedback or school credit.

Put the lessons into practice

Choose a simple imagined motion example and describe it using speed, velocity or acceleration where appropriate. Make a separate force sketch and explain what information it adds. Then consider the same example from an energy perspective, keeping the two explanations distinct. After the wave section, create a comparison sheet for sound and electromagnetic-wave topics using ideas from the source lessons. Check your terms against the recordings and write one question that would make your explanation clearer. Keep the exercise based on study examples rather than an unsupervised experiment.

This optional activity is provided by WikiFree for independent practice. It is not a graded assignment from the instructor. Keep your working notes, check the result against the task you defined and return to the relevant lesson when an assumption or technique is unclear.

Certificate / Assessment

Watching the public videos and using WikiFree progress tracking does not award a certificate, exam voucher, academic credit or instructor assessment.

Use your practice output to review what you can now explain and repeat independently. Completion tracking records your study progress; it does not replace an assessed qualification or professional experience.

Frequently asked questions

Provider: Khan Academy. Videos play from the Khan Academy channel on YouTube.