Chapter+3,+Section+4

What do you see: Whiplash is when the head jerked back and forth due to inertia.

Notes:

When an unbalanced force is exerted on an object, it will accelerate in the same direction.

A=F/M

Whiplash: neck injury that is caused by a rear end collision.

Caused by sudden jerk forward as your body has a force exerted on it, muscles straining to keep it straight.

Without the head rest, nothing is pushing on your head.

Physics To Go

1. Neck injuries are common in car crashes because if a car is going slower than the one that hits it from behind, then the neck would fly backwards and cause damage depending if there is a head rest.

2. Packages move forward in truck if you stop fast because there is nothing holding it down and inertia will carry the box forward due to Newton's first Law.

3. They are pushed backwards because of Newton's First Law because they are at rest, and the body wants to stay at rest while in the seat. When the bus moves forward, the body tries to stay still, until it accelerates to match the speed of the bus, when it seems that there is no force holding you back.

4. This is because the biker has not head rest or back rest at all. So when they are hit, they will fly backwards with more force and possibly hurt themselves severely.

5. The rear-end collision would be the case when the head rest would be most beneficial because when the car hits you from behind, the head will fly back. The head rest will keep the head still during a rear end collision.

6. Collapsible trunks and rear ends would reduce the amount of force exerted on the passenger because when the trunk crushes, it absorbs most of the force from the impact, reducing the total damage to the passenger.

7. The chest strap of a seat belt would reduce both the effects of whiplash in head on and rear end collisions because it would hold the upper body still as the car jerks forward or comes to a sudden stop.