The forces, which meet at one point but their line of action do not lie in one plane,are called

Options

A. non coplanar non concurrent forces
B. non coplanar concurrent forces
C. coplanar concurrent forces
D. coplanar non-concurrent forces

Answer

To solve the question regarding the classification of forces based on their lines of action and their meeting point, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Concurrent Forces**: These are forces that meet at a single point. This means that their lines of action intersect at one point.
- **Coplanar Forces**: These are forces that lie in the same plane.
- **Non-Coplanar Forces**: These are forces that do not lie in the same plane.

2. **Analyze the Given Information**:
- The question states that the forces meet at one point, which indicates that they are concurrent forces.
- However, it also states that their lines of action do not lie in one plane, which indicates that they are non-coplanar forces.

3. **Combine the Concepts**:
- Since the forces meet at a single point (concurrent) and do not lie in the same plane (non-coplanar), we can conclude that these forces are classified as **non-coplanar concurrent forces**.

4. **Select the Correct Option**:
- From the options provided:
- A. Non-coplanar and non-concurrent forces
- B. Non-coplanar concurrent forces
- C. Coplanar concurrent forces
- D. Coplanar non-concurrent forces
- The correct answer is **B. Non-coplanar concurrent forces**.

### Final Answer:
The forces which meet at one point but their line of action do not lie in one plane are called **Non-coplanar concurrent forces**.

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