# Forces and Pressure

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Forces and Pressure

## 1. Magnetic force

### 1.1. Attract object made of iron/steel

1.1.1. Magnetic catch

1.1.2. Needle of compass

1.1.3. Magnetic Crane

## 2. Frictional force

### 2.2. Problems

2.2.1. Make movement more difficlt

2.2.2. Wears away materials

### 2.3. Ways of reducing friction

2.3.1. Oil moving parts so it makes movement easy

2.3.2. Use ball bearings

## 5. How can we measure a force?

### 5.3. Spring Balance

5.3.1. Extension

5.3.2. Compression

## 6. What are the important forces around us?

### 6.1. Gravitational force

6.1.1. Exits between any two objects

6.1.2. Forces that causes objects to be attracted to earth

6.1.3. Weight

6.1.3.1. Gravitational force acting on an object

6.1.3.2. Measured using spring balance in Newtons

6.1.3.3. Greater force pulling on object=Greater weight

6.1.3.4. Depends on location

6.1.4. Mass

6.1.4.1. Amount of matter in a body

6.1.4.2. Constant

6.1.4.3. Measured using a beam balance