# Pressure and force

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Pressure and force

## 1. Force

### 1.3. Effects of a force

1.3.1. can move an object

1.3.2. can stop an object

1.3.3. can change the speed of a moving object

1.3.4. can change the direction of the moving object

### 1.4. Types of forces

1.4.1. Frictional force

1.4.1.1. Created by 2 surfaces in contact with one another

1.4.2. Magnetic force

1.4.2.1. A force with which a magnet attracts an object

1.4.3. Gravitational force

1.4.3.1. A force that causes objects to be attracted to the Earth(due to gravity)

1.4.3.2. Measured in newtons

## 2. Pressure

### 2.3. Calculating pressure

2.3.1. Force over area(force/area)

2.3.2. Example for calculating pressure:

2.3.2.1. Eg. A hippo. Weighs 30000N. It stands on 1 feet with an area of 1000cm sq. What is the pressure on the ground?

2.3.2.2. The answer: We use the formula force/area. Thus the answer is 30000N/1000cm sq = 30N/cm sq

### 2.4. objects with high pressure

2.4.1. sharp knife

2.4.1.1. has a higher pressure as there is more force applied on that small surface area.

2.4.2. high heels

### 2.5. Objects with a lower pressure

2.5.1. blunt knife

2.5.2. camel feet