Choose the correct option for each question. There is only one correct response for each question.
What happens when oil is applied between the hinges of doors?

Options

A. Friction increases
B. Friction decreases
C. Friction remains unchanged
D. Friction disappears completely

Answer

To solve the question, we need to analyze what happens when oil is applied between the hinges of doors. Here’s a step-by-step breakdown of the solution:

### Step 1: Understanding the Role of Oil
- Oil acts as a lubricant. Lubricants are substances that reduce friction between surfaces in mutual contact.

### Step 2: Analyzing the Effect of Lubrication
- When oil is applied to the hinges of a door, it creates a thin layer between the metal surfaces of the hinges. This layer allows the surfaces to slide over each other more easily.

### Step 3: Conclusion on Friction
- As a result of applying oil, the friction between the door hinges decreases. This makes it easier to open and close the door.

### Step 4: Evaluating the Options
- Now, we need to evaluate the provided options:
1. Friction will increase. (Incorrect)
2. Friction will decrease. (Correct)
3. Friction remains unchanged. (Incorrect)
4. Friction disappears completely. (Incorrect)

### Final Answer
- The correct option is: **Friction will decrease.**

---