Fill in the following blanks with suitable words :
Friction produces……………………

Explanation

To fill in the blank for the statement "Friction produces __________," we need to analyze what happens when friction occurs.

### Step-by-Step Solution:

1. **Understanding Friction**: Friction is a force that opposes the relative motion of two surfaces in contact. It occurs when two surfaces rub against each other.

2. **Effects of Friction**: When surfaces rub together, they generate energy. This energy is often converted into heat due to the resistance between the surfaces.

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