# Force & Pressure

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Force & Pressure

## 4. Types of forces

### 4.1. Frictional force

4.1.1. Advantages

4.1.1.1. The friction between the brakes and the wheels helps to slow down the bicycle.

4.1.1.2. The friction between our hands and an object helps us to hold it.

4.1.1.3. The friction between two stones can create a fire.

4.1.2. Disadvantages

4.1.2.1. But sometimes friction can be a nuisance.

4.1.2.2. The friction between the tyres of the vehicle and the road wears out the tyres. Thus, the vehicles may skid on rainy days and cause an accident.

4.1.2.3. The friction between the air and the cyclist slows down the speed of the cyclist.

4.1.3. Friction is a force which slows down and stops a moving object.

4.1.4. It occurs whenever two moving surfaces are in contact.

4.1.5. In addition, it also produces heat.

4.1.6. But friction has advantages and disadvantages also.

### 4.2. Magnetic force

4.2.1. Magnets exert a magnetic force can attract objects made of iron and steel.

4.2.2. Magnets are being used almost everywhere in daily life.

4.2.3. You can see them in the needle of a compass, the door of the fridge and many more things.

4.2.4. When like poles face each face other, they repel. When unlike poles face each other, they attract.

### 4.3. Gravitational force

4.3.1. Gravitational force is a force which pulls the objects toward the Earth. It is also known as gravity. The weight of an object depends on the force of gravity pulling on that object. The greater the force of gravity pulling an object, the heavier the object.