The gravitational force is a

Options

A. contact force
B. action - at -a distance force
C. neither (a) nor (b)
D. both (a) and (b)

Answer

To determine the nature of gravitational force, we need to analyze the options provided and understand the characteristics of gravitational force.

### Step-by-Step Solution:

1. **Understanding Gravitational Force**:
Gravitational force is the force of attraction between two masses. It acts between any two objects that have mass, regardless of their distance apart.

2. **Identifying Types of Forces**:
- **Contact Force**: A force that acts when two objects are in physical contact with each other. Examples include friction, tension, and normal force.
- **Action at a Distance Force**: A force that acts over a distance without the need for physical contact. Examples include gravitational force and electromagnetic force.

3. **Analyzing the Options**:
- **Option 1**: Contact Force - This is incorrect because gravitational force does not require physical contact between the masses.
- **Option 2**: Action at a Distance Force - This is correct because gravitational force acts over a distance between two masses.
- **Option 3**: Neither A nor B - This is incorrect as we have established that gravitational force is indeed an action at a distance force.
- **Option 4**: Both A and B - This is incorrect as gravitational force cannot be both a contact force and an action at a distance force.

4. **Conclusion**:
Based on the analysis, the gravitational force is classified as an **action at a distance force**. Therefore, the correct answer is **Option 2**.