According to Newton's second law, how is force defined?

• A. Force equals mass divided by acceleration
• B. Force equals mass times acceleration
• C. Force equals mass plus velocity
• D. Force equals velocity divided by mass

Answer: (B)

Force is defined by Newton's second law as the product of mass and acceleration. This law states that the force acting on an object is equal to the mass of that object multiplied by its acceleration (F = ma).

Understanding this relationship is crucial because it implies that for a constant mass, any change in the force will result in a proportional change in acceleration. This principle is foundational in physics and helps explain how objects move and respond to various forces in the environment, whether on Earth or in space. For instance, if the mass of an object remains constant and the net force acting on it increases, the acceleration of that object will increase proportionally, illustrating Newton's second law in action.

The incorrect options do not reflect this fundamental relationship. For example, force cannot be defined as mass divided by acceleration, added to velocity, or divided by mass, as these do not accurately represent the interplay between mass, force, and acceleration described by Newton's second law.