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Physics · 术语表

什么是 The newton？

又称： newton

Definition 64.1 Primary & Middle School Physics · 第 64 章 — Weight vs Mass: Measuring Forces

Forces — pushes, pulls, weights, gravitation’s grip — are measured in newtons ( $\mathrm{N}$ ), 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 $50\,\mathrm{N}$ ; a solid handshake squeezes with around $100\,\mathrm{N}$ ; last chapter’s Moon-lease ran to $10^{20}$ .

示例

Example 64.8 (The book on the table, in newtons)

The oldest equilibrium in this book, at last with numbers: a $2\,\mathrm{kg}$ dictionary rests on a desk. Its weight: $P = 2 \times 9.8 = 19.6\,\mathrm{N}$ , drawn as an arrow $2\,\mathrm{cm}$ long at a scale of ten newtons per centimetre, pointing straight down from the book. The desk’s supporting push: $19.6\,\mathrm{N}$ straight up — an equal arrow, opposite way. The tie is exact, and stillness is its proof: the childhood picture, now a measured budget.

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