# Force and Pressure

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Force and Pressure

## 1. Force

### 1.2. Effects of force

1.2.1. Make a stationary object move

1.2.2. Stops a moving object

1.2.3. Change the speed of a moving object

1.2.4. Change the direction of a moving object

1.2.5. Change the size and shape of an object

### 1.3. Apparatus needed to calculate force

1.3.1. Compression spring balance

1.3.2. Extension spring balance

1.4.1. New node

## 2. Pressure

### 2.2. Pressure increases when

2.2.1. contact area between an object and something becomes smaller

2.2.2. force acting on an object increases

### 2.3. SI unit of pressure

2.3.1. Pascal (Pa)

### 2.4. How to calculate Pressure

2.4.1. Pressure= Force/ Area

## 3. Types of forces

### 3.1. Frictional force

3.1.1. occurs when the surfaces of two objects move across each other

3.1.2. always opposes the direction of motion

3.1.3. ways to overcome friction

3.1.3.1. applying lubricants such as oil or grease

3.1.3.2. using ball bearings, wheels or rollers

3.1.3.3. designing objects into streamline shapes

3.1.3.4. having a cushion of air between surfaces

### 3.2. Magnetic force

3.2.1. force of attraction or repulsion produced by magnets

3.2.1.1. like poles repel

3.2.1.2. unlike poles attract

### 3.3. Gravitational force

3.3.1. force of attraction between two bodies as a result of their masses

3.3.2. affected by two factors

3.3.2.1. distances between the objects

3.3.2.2. masses of the object

3.3.3. pulls all objects towards its centre