Motion, Forces and Energy: Free Course

About this course

Study Motion, Forces and Energy in this free English video course from Khan Academy. The classroom preserves all 21 published source recordings, totaling approximately 3h 52m, with their original lesson titles and sequence. The selected curriculum focuses on physical quantities, models and evidence-based calculations. Use the videos to follow an explanation, examine an example and develop a study output you can check independently. The course title describes this recorded subject or learning track; your study can extend beyond watching through the practical activities below.

Course at a glance

What you’ll learn

• Follow the explanation and worked reasoning in “Introduction to high school physics”, then describe the main idea in your own words.
• Follow the explanation and worked reasoning in “Intro to forces (part 1)”, then describe the main idea in your own words.
• Follow the explanation and worked reasoning in “Newton's second law calculations”, then describe the main idea in your own words.
• Follow the explanation and worked reasoning in “Impulse”, then describe the main idea in your own words.
• Connect examples across Motion, Forces and Energy by identifying the terms, assumptions and methods they use.
• Create a small independent practice output and check it against the relevant teaching explanation.

Skills you’ll gain

• Physical models
• Quantities and units
• Scientific reasoning
• Calculations

Course Overview

The source curriculum is presented as a complete recorded video edition of Motion, Forces and Energy. Representative lessons include “Introduction to high school physics”, “Newton's second law calculations” and “Work and power”. These recordings give concrete examples to revisit while building physical quantities, models and evidence-based calculations. Their place in the lesson list is preserved, so you can return to a particular explanation without losing its source position. Introductions, demonstrations, examples, reviews and compilations remain included whenever they appear in the original playlist. Reading a lesson title is useful for locating a topic; working through its reasoning and checking a practice attempt is what makes the recording valuable for learning.

How to study the course

• Videos 1–5: this part of the source list includes “Introduction to high school physics” through “Intro to forces (part 1)”. Identify quantities and units. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.
• Videos 6–10: this part of the source list includes “Intro to forces (part 2)” through “Newton's third law”. State the assumptions of a physical model. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.
• Videos 11–15: this part of the source list includes “Momentum” through “Falling objects”. Connect an equation with the situation represented. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.
• Videos 16–21: this part of the source list includes “Centripetal force” through “Work and power”. Check the interpretation of a result. Keep a brief working note, revisit an unclear explanation and test one example before moving to another part of the material.

Who is this for?

This course suits students and interested readers studying the physics named in the title. It also provides a recorded reference for revisiting a topic after an earlier lesson or study attempt. Choose examples appropriate to your background and allow time to work through the method instead of judging understanding only by how familiar the terminology sounds.

Before you start

Basic arithmetic and algebra are useful. Keep track of units and distinguish the assumptions of a model from an observation.

Put the lessons into practice

Choose a physical situation demonstrated in the recordings. Draw a simple representation, identify the relevant quantities and state the assumptions. Reproduce the calculation or explanation and connect the result with the situation. Change one condition and predict how the result should change before recalculating. Check units and compare with an easy limiting case when appropriate. Finish with a short explanation of how the model helps answer the question and which details it leaves outside the study example.

This optional study activity is provided by WikiFree for independent practice. Keep your working notes and use the relevant classroom recording to check a step, definition or interpretation. It is not an instructor-marked assignment.

Certificate / Assessment

Watching the public videos and using WikiFree completion tracking does not award a certificate, academic credit, an examination voucher or instructor assessment. Use your practice output to review what you can explain and repeat independently. The recorded lessons provide study material; completion tracking records your progress through that material.

Frequently asked questions

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