Select the correct option about the friction between the two bodies

Options

A. Static friction is always greater than kinetic friction
B. Limiting friction is always greater than kinetic friction
C. Limiting friction is not always greater than kinetic friction
D. The direction of friction is always opposite to motion

Answer

To solve the question regarding the correct options about friction between two bodies, we will analyze each option based on the principles of friction.

### Step-by-Step Solution:

1. **Understanding Static and Kinetic Friction**:
- Static friction is the friction that prevents two surfaces from sliding past each other. It acts when an external force is applied but not enough to cause motion.
- Kinetic friction, on the other hand, is the friction acting on two surfaces that are sliding against each other.

2. **Analyzing Option 1**:
- The statement claims that static friction is always greater than kinetic friction.
- This is generally true up to a certain point (the maximum static friction), but once the object starts moving, kinetic friction is usually less than static friction.
- Therefore, this option is **incorrect**.

3. **Analyzing Option 2**:
- This option states that limiting friction (the maximum static friction) is always greater than kinetic friction.
- Experimentally, it has been observed that the maximum static friction (fs) is indeed greater than the kinetic friction (fk) when an object starts moving.
- Thus, this option is **correct**.

4. **Analyzing Option 3**:
- The statement claims that limiting friction is not always greater than kinetic friction.
- Since we established that limiting friction is greater than kinetic friction, this option is **incorrect**.

5. **Analyzing Option 4**:
- This option states that the direction of friction is always opposite to the motion.
- While friction generally opposes the direction of motion, in some cases (like in the case of a vehicle accelerating), friction can act in the direction of motion (e.g., when tires push against the ground).
- Therefore, this option is also **incorrect**.

### Summary of Options:
- **Option 1**: Incorrect
- **Option 2**: Correct
- **Option 3**: Incorrect
- **Option 4**: Incorrect

### Final Answer:
The correct option regarding friction between the two bodies is **Option 2**.