CoachForces — pushes, pulls, weights, gravitation’s grip — are measured in newtons (), honoring the author of the law of gravitation. Handy anchors: one newton is about the weight of a small apple (history smiles); your schoolbag weighs some ; a solid handshake squeezes with around ; last chapter’s Moon-lease ran to .
Examples
Example 64.8 (The book on the table, in newtons)
The oldest equilibrium in this book, at last with numbers: a dictionary rests on a desk. Its weight: , drawn as an arrow long at a scale of ten newtons per centimetre, pointing straight down from the book. The desk’s supporting push: straight up — an equal arrow, opposite way. The tie is exact, and stillness is its proof: the childhood picture, now a measured budget.