Physics Force Question!- Newton's Laws!?

Question

If you are in a car that is struck from behind, you can receive a serious neck injury called whiplash.

Using Newton's laws of motion, explain what happens.
How does a headrest reduce whiplash?

Answer 1

because when the car is hit it sends you and the car foward, by pressing the breaks the car stops but you keep travelling*1, your belt then stops you travelling and the force of hitting the belt sends you back2* resulitng in your nick doing a whip lash movement, the head rest stops your neck going back to much*1

1a object will remain moving until acted upon by another force
t2o every action there is a re-action equal to it

Answer 2

When a car hits another one from behind, the car it hits is accelerated foward. The seat of the car is accelerated with the car because it's attatched to the car. The seat then presses into the persons back and accelerates the persons torso. The persons torso then applies a force to the persons neck, accelerating the neck. The persons neck then applies a force to the persons head, accelerating the head. The persons head doesn't go as fast as the car immediately because the persons head has inertia. Inertia is the ability of an object to resist a change in its speed or direction. And this resistance shows up as a force going in the oposite direction of the acceleration. And going from 0 to whatever speed the person's torso is moving, is a change in speed. So the neck gets two forces applied to it. One going foward from the torso and one going backward from the heads inertia. This stretches out and bends the neck. If the forces are strong enough and the neck bends and stretches enough, injury results. When a headrest is there, it applies force directly to the back of the head(becuase the headrest is attatched to the seat which is going the same speed as the torso and car), helping the neck to accelerate the head, and less force is applied to the neck. Most of the backward inertia force from the head goes into the rest and not into the neck

Answer 3

im doing an identical factor this three hundred and sixty 5 days... ok there are basically 3 newtons regulations (i'm particularly helpful). the forces performing on it: friction (air resistance), gravity, and of direction the racket yet after it is hit the only forces are gravity and air resistance. the 1st regulation: gadgets have inertia. the ball will shop going through fact of its tendency to stay in action, until the different forces performing on it make it give up. 2d: stress= mass x acceleration. nicely thats exceedingly self explanatory. the stress that the ball has equals its mass (no longer its weight) accelerated by skill of its acceleration (it is exchange in velocity) third: each and every reaction has an equivalent and opposite reaction. the stress of the racket on the ball skill that there is likewise a stress being exerted back on the racket by skill of the ball. in spite of the shown fact that on account that this impacts the racket and not the ball, the ball retains going. i'm hoping that enables! i spent various time....