# Force and Pressure

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Force and Pressure

## 1. WEIGHT

### 1.5. decreases with increasing distance from the centre of the Earth

1.5.1. a man has smaller weight when he is at the top of a tall mountain compared with when he is at sea level

## 3. Pressure

### 3.1. the force acting per unit area

3.1.1. the bigger the force, the greater the pressure exerted

3.1.2. the smaller the contact area, the greater the pressure

### 3.3. can be increased by reducing the contact area

3.3.1. eg. a sharp knife - greater pressure can be applied with the same force as it has a smaller contact area

### 3.4. can be reduced by increasing the contact area

3.4.1. eg. farm tractors have large and wide tyres that reduce the pressure applied on the soft soil.

## 4. Types of forces

### 4.1. Gravitational force

4.1.1. The Earth exerts a pulling force on all objects

### 4.2. Frictional force

4.2.1. The force that acts to oppose the direction of motion

### 4.3. Magnetic force

4.3.1. The force acting on magnetic materials

## 6. Gravitational force

### 6.1. The force that causes all objects to fall to the ground.

6.1.1. Without gravity, objects would be floating in the air

## 8. Frictional force

### 8.3. acts in the opposite direction to motion.

8.3.1. prevents stationary object from starting to move when forces act on them

8.3.2. can also slow things down

### 8.5. can also be a nuisance

8.5.1. can overheat machines

8.5.2. causes wear and tear

8.5.2.1. eg. car tyres and the soles of our shoes

### 8.6. can reduce unwanted friction

8.6.1. lubricating

8.6.2. polishing the surface; smooth surface

8.6.3. using ball bearings