Identify the correct statement.

Options

A. Static friction depends on the area of contact.
B. Kinetic friction depends on the area of contact.
C. Coefficient of static formation does not depend on the surfaces in contact.
D. Coefficient of kinetic friction is less than the coefficient of static friciton.

Explanation

To solve the question of identifying the correct statement regarding friction, we will analyze each of the statements provided in the question.

### Step-by-Step Solution:

1. **Understanding Static and Kinetic Friction**:
- Static friction is the friction that exists between a stationary object and the surface it's on. It prevents the object from starting to move.
- Kinetic friction is the friction acting on an object that is already in motion.

2. **Analyzing the Statements**:
- **Statement 1**: "Static friction depends on the area of contact."
- This statement is incorrect. Both static and kinetic friction do not depend on the area of contact.

- **Statement 2**: "Kinetic friction depends on the area of contact."
- This statement is also incorrect for the same reason as above. Kinetic friction does not depend on the area of contact.

- **Statement 3**: "Coefficient of static friction does not depend on the surface in contact."
- This statement is incorrect. The coefficient of static friction does depend on the nature of the surfaces in contact.

- **Statement 4**: "Coefficient of kinetic friction is less than the coefficient of static friction."
- This statement is correct. The coefficient of kinetic friction is indeed less than the coefficient of static friction.

3. **Conclusion**:
- After analyzing all the statements, we find that the only correct statement is the fourth one: "Coefficient of kinetic friction is less than the coefficient of static friction."

### Final Answer:
The correct statement is: **"Coefficient of kinetic friction is less than the coefficient of static friction."**