Up for a swing

Classical Mechanics Level 1

When spinning on an office chair, you can increase your angular velocity by pulling your arms and legs in toward the center. Can you likewise go higher on a swingset by pulling your legs up close to your chest?

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Up for a swing

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.