State two advantages and two disadvantages of friction.

Explanation

### Step-by-Step Solution:

**Step 1: Identify the Advantages of Friction**
1. **Helps in Walking**: Friction provides the necessary grip between our shoes and the ground, allowing us to walk without slipping.
2. **Braking Mechanism**: Friction is essential for the functioning of brakes in vehicles (bicycles, motorcycles, and cars). It helps in stopping the vehicle by converting kinetic energy into heat energy.

**Step 2: Identify the Disadvantages of Friction**
1. **Heat Generation**: When brakes are applied, friction generates a significant amount of heat. This heat can lead to wear and tear of the brake components and tires, causing them to degrade faster.
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