_____ is the force that opposes motion between any surfaces that are in contact

Options

A. Friction
B. Pressure
C. Static motion
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for the name of the force that opposes motion between surfaces that are in contact.

2. **Identifying the Relevant Concept:**
In physics, when two surfaces are in contact and one surface attempts to move relative to the other, a specific force acts to resist this motion.

3. **Defining the Force:**
This resisting force is known as "friction." Friction acts in the opposite direction of the motion, thereby opposing it.

4. **Explaining the Mechanism:**
When one surface moves or tries to move over another, the microscopic irregularities on the surfaces interact, creating a force that opposes the motion. This is true for both static (not moving) and kinetic (moving) friction.

5. **Conclusion:**
Therefore, the answer to the question is: "Friction."

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