What defines weight in the context of physical science?

• A. The mass of an object only
• B. The effect of gravity on an object
• C. The resistance of an object to motion
• D. The total energy stored in an object

Answer: (B)

In the context of physical science, weight is defined as the effect of gravity on an object. Weight is a force that results from the gravitational pull acting on an object's mass. It is measured in newtons (N) and is dependent not only on the mass of the object but also on the strength of the gravitational field in which the object is located.

For instance, an object with a mass of 1 kilogram weighs approximately 9.81 newtons on Earth due to the acceleration of gravity. However, if the same object were on the Moon, where gravity is weaker, it would weigh less, demonstrating how weight is a variable influenced by gravitational forces.

The other options do not accurately describe weight. Mass refers to the quantity of matter in an object and does not change regardless of location, making it distinct from weight. The resistance of an object to motion relates to its inertia, not weight. Similarly, the total energy stored in an object pertains to its potential and kinetic energy, which again is a different concept from weight. Therefore, identifying weight as the effect of gravity provides a clear and accurate definition that is foundational to understanding forces in physics.