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Chapter 5 The Laws of Motion Các định luật về chuyển động

1-The Concept of Force
2-Newton’s Laws ➔ Dynamics Equations → Inertia – The tendency to resist any attempt to change its velocity 1. Forces always occur in pairs. 2. The action & reaction forces must act on different objects and be of the same type ෍F Ԧ = 0 → a Ԧ = 0 a Ԧ = F Ԧ m F12 = −F21 1. Mass – measure of inertia 2. Force – causes a change in motion of an object A. Newton’s first law B. Newton’s second law C. Newton’s second law D. Newton’s Law of Universal Gravitation Fg = G m1m2 r 2 G = 6,674.10-11 N.m2 /kg2 The Gravitational Force Fg(O−E) = G ME RE + h 2 . m g = G ME RE + h 2 Free-fall acceleration or Gravitational acceleration Fg = mg → Fg = m → g Fg Fg Fg → n

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