# Newtons Second Law Unit 1 Mod.1 A2 OCR

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- Created by: Captain Jack Sparrow
- Created on: 18-06-13 17:22

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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

- a = ?v/?t
- Remember from Newtons 1st Law?

- so, F ? m?v/?t

- ?p = m?v

- F ? ?p/?t

- Proof
- Mass
- The inertia of an object
- (how difficult it is to accelerate an object)

- Remains constant

- The inertia of an object
- 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!

- Gravitational force the Earth exerts on an object

- Definition

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