Choose the correct option for each question. There is only correct response for each question.
What kind of substances are known as lubricants

Options

A. Increase friction
B. Decrease friction
C. Increase or decrease friction
D. None of these

Answer

To solve the question "What kind of substances are known as lubricants?", we can follow these steps:

### Step 1: Understand the Role of Lubricants
Lubricants are substances that are applied between two surfaces to reduce the friction between them.

### Step 2: Analyze the Options
We have four options to consider:
1. Increase friction
2. Decrease friction
3. Increase or decrease friction
4. None of these

### Step 3: Identify the Correct Option
Since lubricants are specifically used to reduce friction, we can eliminate options 1, 3, and 4.

### Step 4: Conclusion
The correct option is **2. Decrease friction**.