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Imagine There's No Friction, It's Easy If You Try

Classical Mechanics Level 1

If we live in a world without friction, which of the following would be possible?

Walk on a horizontal sidewalk Ride a bicycle Climb a vertical pole Jump into the air Drive around a curve on a flat roadway

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.

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by Jerry Han Jia Tao

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