## 1. Force

### 1.1. Definition

1.1.1. A force is a push or pull exerted on an object that can cause it to change its velocity (to accelerate), direction, or shape.

### 1.2. Unit

1.2.1. Measured in Newtons (N), where 1 Newton is the force required to accelerate 1 kilogram of mass by 1 meter per second squared (1 N = 1 kg.m/s²).

### 1.3. Formula

1.3.1. P x A where P is referred to as pressure and A is referred to as area over which force is applied.

### 1.4. Example

1.4.1. •Pushing a Cart: Applying force to move a shopping cart. • Pulling a Rope: Exerting force to pull a rope in tug-of-war.

## 2. Pressure

### 2.1. Definition

2.1.1. Pressure is the force applied per unit area on the surface of an object.

### 2.2. Unit

2.2.1. Measured in Pascals (Pa), where 1 Pascal is equal to 1 Newton per square meter (1 Pa = 1 N/m²).

### 2.3. Formula

2.3.1. P=F/A. • Where F is pressure, F is force, and A is the area over which the force is applied.

### 2.4. Example

2.4.1. •Standing on the Ground: The pressure exerted by feet on the ground. • Inflating a Balloon: Air pressure inside a balloon causes it to expand.