# Newtons Second Law Unit 1 Mod.1 A2 OCR

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• Newtons Second Law
• Definition
• Rate of change of momentum is directly proportional to NET force
• F ? ?p/?t
• IMPORTANT: use the correct 'directly proportional' symbol in place of "?" it was the closest i could find on computer
• F ? ?p/?t ? ma
• Proof
• F ? ?p/?t
• ?p = m?v
• so, F ? m?v/?t
• a = ?v/?t
• So, F ? ma
• Remember from Newtons 1st Law?
• Mass
• The inertia of an object
• (how difficult it is to accelerate an object)
• Remains constant
• Weight
• Gravitational force the Earth exerts on an object
• g = acceleration due to gravity from Earth
• W = mg
• g = acceleration due to gravity from Earth
• F = ma
• Hence Weight is a Force and is measured in Newtons
• Varies slightly around Earth and certainly around the Universe!