# Chapter 2-Forces

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Chapter 2-Forces

## 2. Newton's Laws

### 2.1. 1. Inertia - object moves until forces change its movement, or at rest till forces move it

2.1.1. Equilibrium

2.1.1.1. moving at constant speed and direction

2.1.1.2. staying at rest

### 2.3. 3. For every action, there is an equal and opposite reaction; within an interaction pair of 2 objects

2.3.1. Internal forces

2.3.2. External forces

## 3. Field Forces

### 3.1. Gravitational

3.1.1. Newton's Law: any two objects exert gravitational forces on each other that are related to distance and mass

3.1.1.1. F = G*m1*m2 / r^2

3.1.1.2. G = universal gravitational constant

## 4. Contact Forces

4.2.1. Kinetic

4.2.2. Static

### 4.3. Tension

4.3.1. ideal pulley or cord

4.3.2. typically studied in biomechanics

## 7. Vectors

### 7.4. measured using two methods

7.4.1. Polar method: descriptive, vector arrow with angle to horizontal

7.4.2. Step method: x hat and y hat, make triangle of x and y components, use SOH CAH TOA