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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Physics · 术语表

什么是 Momentum？

Definition 25.1 High School Physics · 第 25 章 — Newton’s Laws

The momentum of a body of mass $m$ ( $\mathrm{kg}$ ) moving with velocity $\vect v$ is the vector

\vect p = m \vect v \qquad (\mathrm{kg}\,\mathrm{m}/\mathrm{s}):

the velocity, weighted by the mass; for a system, the vector sum over its parts.

示例

Example 25.7 (Average force, no details needed)

A $1300\,\mathrm{kg}$ car goes from rest to $100\,\mathrm{km}/\mathrm{h}$ ( $27.8\,\mathrm{m}/\mathrm{s}$ ) in $8.0\,\mathrm{s}$ : whatever the instant-by-instant story, the average net force is $\Delta p/\Delta t = 1300 \times 27.8/8.0 \approx 4.5 \times 10^{3}\,\mathrm{N}$ — momentum turns a force question into before-and-after bookkeeping.

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