Which of the following is not a vector quantity?

• A. Weight
• B. Nuclear spin
• C. Momentum
• D. Potential energy

To determine which option is not a vector quantity, let's first clarify what a vector quantity is. A vector has both magnitude and direction, while a scalar has only magnitude.

Analyzing the Options

• Weight: This is a vector quantity because it has both magnitude (how heavy something is) and direction (toward the center of the Earth).
• Nuclear Spin: This is also considered a vector quantity, as it describes the intrinsic angular momentum of particles, which has direction.
• Momentum: This is a vector quantity as well, defined as the product of mass and velocity, incorporating both magnitude and direction.
• Potential Energy: This is a scalar quantity. It represents energy stored due to position but does not have a direction associated with it.

Final Answer

The option that is not a vector quantity is D. Potential energy.