Which of the following is not a Newton’slaw of motion?A. The time rate of change of linearmomentum is directly proportional to theexternal force applied and it takes place inthe direction of the force.B. In the absence of external forces, anobject at rest remains at rest and an objectin motion continues in motion with aconstant velocity.C. If two objects interact, the force ℱ12exerted by object 1 on object 2 is equal inmagnitude and opposite in direction to theforce
Question
Which of the following is not a Newton’slaw of motion?A. The time rate of change of linearmomentum is directly proportional to theexternal force applied and it takes place inthe direction of the force.B. In the absence of external forces, anobject at rest remains at rest and an objectin motion continues in motion with aconstant velocity.C. If two objects interact, the force ℱ12exerted by object 1 on object 2 is equal inmagnitude and opposite in direction to theforce
Solution
All of the options A, B, and C are actually Newton's laws of motion.
A. This is Newton's second law of motion which states that the rate of change of momentum of a body is directly proportional to the force applied and occurs in the direction in which the force is applied.
B. This is Newton's first law of motion, also known as the law of inertia. It states that an object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by an unbalanced force.
C. This is Newton's third law of motion which states that for every action, there is an equal and opposite reaction.
So, none of the options provided are NOT a Newton's law of motion.
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