Question

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

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

Hint:

Coplanar vectors are two vectors that lie on the same plane. If the vectors meet, they are referred to as concurrent vectors. 

Answer 1

The Correct Option is A

Lines of action that do not lie in the same plane imply "non-coplanar". The vectors meeting at one point implies "concurrent".

Hence, Option A) non-coplanar concurrent forces is the correct answer.

Answer 2

The correct option is (A): Non-coplanar concurrent forces

Explanation: The forces are concurrent as they meet at a point. They are non-coplanar as they do not lie in one plane.

So, the forces, which meet at one point but their lines of action do not lie in one plane, are called non-coplanar concurrent forces.

Answer 3

Hint: The force is a vector quantity. Coplanar vectors are two vectors that lie on the same plane. If the vectors meet, they are referred to as concurrent vectors. 

Complete answer:

From the above information, we can gather - 

• The forces meet at a point, however, their lines of action are not there in one plane.
• Therefore, these forces are known as non-coplanar.

1. Non-coplanar concurrent forces – Forces do not lie in a plane but meet at one point.
2. Coplanar concurrent forces – Forces lie in a plane and meet at one point.
3. Non-coplanar non-concurrent forces – Forces neither lie in one plane nor meet at one point.
4. Coplanar non-concurrent forces – Forces lie in one plane but do not meet at one point.

Hence, the forces, which meet at one point but their lines of action are not on the same plane, are known as non-coplanar concurrent forces. 

Thus, option (B) is correct.

Note: If the vectors are on the same line, then, they are called collinear vectors

• If the vectors start from the same initial point and have a different terminal point, then, the vectors are called co-initial, Coterminal vectors
• If the vectors exist from different initial points and terminate at the same point, then, the vectors are called coterminal.