Uploaded August 2026 | Updated September 2026, 2 weeks ago

---

khanacademy.org/science/telangana-class-8-science?lang=en

What do chewing food, lifting weights, and writing a letter have in common?

A force, and it comes from inside your own body.
In this video we break down muscular force in the simplest way possible.

You will learn what a contact force is, how your muscles push and pull, why they always work in pairs, and how this same force quietly runs your heartbeat and breathing every second.

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!

Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month.
Support Us: india.khanacademy.org/donate