Choose the correct option for each question. There is only correct response for each question.
Friction is a ______

Options

A. Contact force
B. non-contact force
C. magnetic force
D. None of these

Answer

To solve the question "Friction is a ______", we need to analyze the options provided and understand the nature of friction.

### Step-by-Step Solution:

1. **Understanding Friction**: Friction is a force that opposes the motion of an object. It acts when two surfaces are in contact with each other.

2. **Identifying the Type of Force**:
- **Contact Force**: This is a force that occurs when two objects are physically touching each other. Friction falls into this category because it arises from the interaction between surfaces.
- **Non-Contact Force**: These forces act at a distance, such as gravitational or magnetic forces. Friction does not belong to this category.
- **Magnetic Force**: This is a specific type of non-contact force that arises from magnets. Friction is not related to magnetism.
- **None of These**: This option would imply that friction does not fit into any of the other categories, which is incorrect.

3. **Conclusion**: Since friction occurs when two surfaces are in contact and it opposes the motion of an object, we can conclude that friction is a **Contact Force**.

### Final Answer:
Friction is a **Contact Force**.

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