# Forces and Pressure

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Forces and Pressure by

## 1. Effects of force

### 1.1. Change the speed of a moving object

1.1.1. Sub Idea 1

1.1.2. Sub Idea 2

## 3. Frictional Force

3.1.1. It occurs when two moving surfaces are in contect.

3.1.2. Frictions slows down and stops a moving object

### 3.2. The use of Frictional Force

3.2.1. It holds a nail in a wall, but it wears away materials

### 3.3. Ways to reduce Friction

3.3.1.1. Ball Bearings

3.3.1.2. Oil

3.3.1.3. Water

## 4. Pressure

### 4.1. Pressure increases when:

4.1.1. The force increases

4.1.2. The area decreases

### 4.2. Pressure is the force acting per unit area

4.3.1. Pressure = Force / Area

4.3.2. SI unit: N/m2 or Pascal (Pa)

4.3.3. Other units: N/cm2

## 5. Gravitational Force

5.1.1. Its a force that pulls the objects towards the Earth.

5.1.2. The greater the force of gravity pulling an object, the heavier the object

### 5.2. Weight

5.2.1. As weight is a force, it is measured using a spring balance and is measured in Newtons