Fill in the following blanks with suitable words :
Friction always opposes………………………between the surface in contact with each other .

Options

A. Motion
B. Shifting
C. Tilting
D. All of these

Explanation

To fill in the blank in the statement "Friction always opposes __________ between the surfaces in contact with each other," we need to understand the role of friction in physical interactions.

### Step-by-Step Solution:

1. **Understanding Friction**: Friction is a force that acts between two surfaces that are in contact. It resists the relative motion of the surfaces.

2. **Identifying the Context**: The question asks what friction opposes. Since friction acts to resist movement, we need to think about what type of movement occurs when two surfaces are in contact.

3. **Considering Examples**: For instance, when you push a box across a table, the friction between the box and the table opposes the motion of the box moving forward.

4. **Filling in the Blank**: Based on the understanding that friction resists movement, we can conclude that friction opposes "motion."

5. **Final Answer**: Therefore, the complete statement is: "Friction always opposes motion between the surfaces in contact with each other."