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

Options

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

Answer

To solve the question, we need to identify the type of forces described in the statement. Here’s a step-by-step breakdown:

### Step 1: Understand the Definition of Forces
We need to clarify the definitions of the terms involved in the question. The question mentions two important characteristics of the forces:
1. They meet at one point.
2. Their lines of action do not lie in one plane.

### Step 2: Identify the Type of Forces
Based on the definitions:
- **Concurrent Forces**: These are forces that meet at a single point. This means that regardless of their direction, they all converge at one location.
- **Non-Coplanar Forces**: These are forces whose lines of action do not lie in the same plane. This means that if you were to draw the lines of action of these forces, they would not all be contained within a single flat surface.

### Step 3: Combine the Definitions
The question specifies forces that meet at one point but do not lie in the same plane. Therefore, we are looking for forces that are both concurrent and non-coplanar.

### Conclusion
The forces that meet at one point but whose lines of action do not lie in one plane are called **non-coplanar concurrent forces**.

### Final Answer
The correct answer is **non-coplanar concurrent forces**.

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