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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100 Day Summer Challenge

Up for a swing

Excel in math and science

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Courses

Topics

Community

100 Day Summer Challenge

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, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

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

Master advanced concepts through explanations,
examples, and problems from the community.

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

Master advanced concepts through explanations,
examples, and problems from the community.

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