A person standing motionless between a straight highway and an airport runway. A truck drives by the person at constant speed, while an airplane accelerates down the runway for take off. Of the person, truck, and airplane, which are an inertial frame of reference?
A. truck and airplane only
B. person and truck only
C. person only
D. person, truck, and airplane Help
Inertial frame of reference
An object can be considered an inertial frame of reference if there is no net force acting on it. In other words, the object must not have acceleration.
Answer and Explanation:
Since the person is motionless, the person is not accelerating, thus he can be considered as an inertial frame reference.
Since the truck runs at a constant speed, the truck is not accelerating, thus it can be considered as an inertial frame reference.
Since the airplane is accelerating, it cannot be considered as an inertial frame reference.
Thus, the answer is letter B. person and truck only.
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from General Studies Science: Help & ReviewChapter 4 / Lesson 12