# Chapter 4

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Chapter 4

## 1. Gravitational Field Strength

### 1.1. Gravitational Force

1.1.1. Varies due to the mass of place

1.1.2. Stronger on earth than moon as earth has a heavier mass

1.1.3. Pulls objects towards earth

1.1.4. Strongest at surface, weaker as it gets further away

### 1.2. Gravitational Field Strength g is defined as the gravitational force acting per unit mass

1.2.1. Gravitational Field is a region in which a mass experiences a force due to gravitational attraction

1.2.1.1. The gravitational force is experienced at its strongest at the surface of the Earth and gets weaker further away.

## 2. Inertia

### 2.3. Example:

2.3.1. Why should people wear seat belts? When there is a sudden neat to brake, the driver would continue to move forward due to his inertia

2.3.1.1. Without seat belts, the driver would crash into the windscreen

2.3.1.2. With seat belts, the driver would not crash into the windscreen

## 3. Weight

### 3.5. Changes with location

3.5.1. A man has a mass of 60kg on Earth as the gravitational field strength of Earth is 10N/kg^2

3.5.2. On the moon, he would be 10kg as the gravitational field strength on the Moon is 1.6N/kg^2