Even a Little First-Grader Can Stay Up on a Bicycle

question 35

Multiple Choice

Even a little first-grader can stay up on a bicycle if he can get his bicycle moving fast enough because

• A) the angular momentum of the wheels wants to stay horizontal, due to conservation of angular momentum.
• B) the first-grader's weight causes a torque too small to make the bicycle fall sideways when moving.
• C) pedaling faster is easier once you are stable, and more pedaling increases net angular momentum.
• D) All of these.

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