SSC
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The inertia of the car causes the head to jerk forward
|
|
|
The inertia of the head causes it to remain in place, while the car and body move forward
|
|
|
The inertia of the head causes it to jerk forward, while the car remains in place
|
|
|
This has to do with Newton’s second law, not first.
|
Detailed explanation-1: -How do headrests help to guard against this type of injury? The Newton’s law of inertia occurs when the passenger seats in the vehicle shift forward as the vehicle goes forward. Headrests help to guard against neck injuries by keeping the body and head moving together when the car accelerates forward suddenly.
Detailed explanation-2: -The passenger’s head will remain at rest for the split second when the seat exerts a big force on the passenger’s back causing a “whiplash” on your neck. This is an example of newton’s first law because your head is not acted on by an unbalanced force while the rest of your body is.
Detailed explanation-3: -If you are in a car at rest that gets hit from behind, you can suffer a serious neck injury called whiplash.