Which statement best summarizes Newton's Second Law?

Which statement best summarizes Newton's Second Law?

• A. The acceleration of an object is proportional to the net force acting on it and inversely proportional to its mass.
• B. For every action, there is an equal and opposite reaction.
• C. Energy cannot be created or destroyed.
• D. Kinetic energy is energy stored due to position.

Answer: (A)

Newton's Second Law describes how motion changes when a net force acts on an object. The key idea is that acceleration is directly proportional to the net force and inversely proportional to the object's mass. In simple terms, pushing harder makes an object accelerate more, but a heavier object resists that change and accelerates less for the same push. This is captured by F = m a: the net force determines how quickly velocity changes, and the mass sets how large that change is. The direction of acceleration is the same as the direction of the net force. For example, doubling the force on the same mass doubles the acceleration, while doubling the mass for the same force halves the acceleration. The other statements relate to different ideas: action-reaction is Newton's Third Law, energy cannot be created or destroyed is conservation of energy, and kinetic energy is the energy of motion while potential energy is energy stored due to position.

Newton's Second Law describes how motion changes when a net force acts on an object. The key idea is that acceleration is directly proportional to the net force and inversely proportional to the object's mass. In simple terms, pushing harder makes an object accelerate more, but a heavier object resists that change and accelerates less for the same push. This is captured by F = m a: the net force determines how quickly velocity changes, and the mass sets how large that change is. The direction of acceleration is the same as the direction of the net force. For example, doubling the force on the same mass doubles the acceleration, while doubling the mass for the same force halves the acceleration. The other statements relate to different ideas: action-reaction is Newton's Third Law, energy cannot be created or destroyed is conservation of energy, and kinetic energy is the energy of motion while potential energy is energy stored due to position.