Natural Science CLEP Prep Practice Exam

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What is Newton's Second Law of Motion?

  1. Force = Mass x Acceleration

  2. Objects in motion tend to stay in motion

  3. Force is equal to the change in momentum over a period of time

  4. Objects at rest tend to stay at rest

The correct answer is: Force = Mass x Acceleration

Newton's Second Law of Motion states that the force applied to an object is directly proportional to the mass of the object and its resulting acceleration. This means that as the mass of an object increases, the force needed to accelerate it also increases. This law also shows that the acceleration of an object is inversely proportional to its mass, meaning that as the mass increases, the acceleration decreases. Option B, objects in motion tend to stay in motion, is referring to Newton's First Law of Motion, which states that an object will continue moving at the same velocity unless acted upon by an external force. Option C may be confused with the Law of Conservation of Momentum, which states that the total momentum of any closed system will remain constant unless acted upon by external forces. Finally, option D is referring to Newton's First Law again, but specifically for objects at rest.

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