PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
A car is hit sharply from behind. If the front seats do not have headrests, the passenger’s neck may be injured. Which explanation best describes this injury?
(a) The head continues to move forward due to inertia of motion while the torso remains at rest.
(b) Air resistance pulls the head backward, producing a large force on the neck.
(c) The head tends to remain at rest while the torso is pushed forward, stretching the neck.
(d) The sudden forward motion of the car increases the weight of the head, straining the neck.