# Forces and Pressure

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Forces and Pressure

## 1. Forces

### 1.2. Effects

1.2.1. Changes in shape and size

1.2.2. Start or stop an object

1.2.3. Change the speed of an object

1.2.4. Change the direction of an object

### 1.3. Measuring forces

1.3.1. Using force meters

1.3.1.1. Spring Balances

1.3.1.1.1. Compression

1.3.1.1.2. Extension

1.3.2. Measured in Newton(N)

### 1.4. Important Forces

1.4.1. Friction

1.4.1.1. Occurs when two moving surfaces are in contact

1.4.2. Magnetic

1.4.2.1. Exerted by a magnet on a magnetic material or a magnet

1.4.3. Gravity

1.4.3.1. Exists between any two objects

1.4.3.2. Causes all objects to be attracted to the Earth

## 2. Weight

### 2.1. Amount of gravitational force acting on an object

2.1.1. Greater of the force of gravity pulling an object, greater the weight

## 3. Pressure

### 3.2. Increase In Pressure

3.2.1. Force Increases

3.2.2. Area Decreases

### 3.3. Decrease in Pressure

3.3.1. Force decreases

3.3.2. Area Increases

### 3.4. Calculating Pressure

3.4.1. Formula

3.4.1.1. Pressure=Force/Area

3.4.2. Units

3.4.2.1. SI Unit

3.4.2.1.1. N/m2

3.4.2.1.2. Pascal(Pa)

3.4.2.2. Common Unit

3.4.2.2.1. N/cm2