Final answer:
The statement that unnecessary movement is one of the most dangerous threats to a seriously injured victim is true. Such movement can lead to severe complications by potentially exacerbating spinal injuries, fractures, or internal damage. It's important for first responders to immobilize and stabilize the victim properly.
Step-by-step explanation:
1) True. One of the most dangerous threats to a seriously injured victim is unnecessary movement. Unnecessary movement can exacerbate injuries, especially if there are potential spinal injuries or fractures. In such cases, moving the injured person can lead to severe complications, including paralysis or further damage to internal organs.
In the context of Newton's Third Law of Motion, understanding forces is crucial when handling an injured person. When two forces act upon each other, they are indeed equal and opposite, as specified in question 4.4, which is true. However, when dealing with an injured person, any additional forces from unnecessary movement could unbalance these forces and cause harm.
Force applied unnecessarily can disrupt the natural healing processes or aggravate the injury further. Therefore, it is critical for first responders and bystanders to immobilize and stabilize a seriously injured victim while awaiting professional medical assistance.