I twist and turn, yet I lead straight ahead, guiding movement through friction. What am I?

Category: Science · Difficulty: hard

Hint: Think about the mechanics in machines.

Answer

A gear system

Explanation

A gear system translates rotational motion through the engagement of toothed wheels, providing mechanical advantage.

This is a hard science riddle — a tricky one that takes a little thought. The answer is A gear system.

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