Asked by Lily

Explain why should torques, not forces, play essential roles in the following actions.

(a) open or close a door

(b) tighten or loosen a screw using a wrench

c) "Give me a place to stand, and I shall move the Earth with it"
Answered by Damon
(a) rotation around sticky hinge

(b) rotation of screw

(c) rotation around fulcrum of lever
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