car headrest

In term of Newton's first law (the law of inertia), how does a car headrest help to guard against whiplash in a rear-end collision?

First law
There exists a set of inertial reference frames relative to which all particles with no net force acting on them will move without change in their velocity. This law is often simplified as "A body persists its state of rest or of uniform motion unless acted upon by an external unbalanced force." Newton's first law is often referred to as the law of inertia.

Your body is shoved forward when you are hit from behind while in your car. Since your head is not touching the back of the seat it won't be pushed forward as fast and tends to keep traveling at the old rate of speed so it looks like it is going backwards. Really, it just isn't going forwards as fast as the rest of your body is. The headrest keeps your head from going back any further than the headrest, hyper-extending your neck. So the headrest starts pushing your head forward at the same speed as your body, keeping them aligned.

2009-01-26 00:48:03 by K a t r i n a.

Available at www.handyheadresthanger.com. The Handy Headrest Hanger provides an alternative to using the car coat hooks that are installed by the ...

I need a sewing pattern to make a easy slip off cover for car seat headrest. My boyfriend has tvs in his head rests in his car. I want him to have something nice to slip on and off for security reasons. I don't want them to get stolen.

Got some wax paper? Place a sheet on the side of the headrest, and use your fingernail to copy the seamline around the edge. Mark the top edge.

Take a look at the shape you've drawn, and find the widest part... draw a horizontal line there on your wax paper.
Draw two lines extending perpendicular to the horizontal line, at the intersection of the original shape. Now you've got a shaped upper part
and a straight up and down lower part.
Add 1" all around the pattern you've just made -- this is a combination of a little extra ease and a 5/8" seam allowance. Add an additional 1/2" at the bottom for hem.

Measure around the edges of the pattern, excluding the bottom edge. Just for grins, let's say this was 8" high in the back, 2" of thickness, and 9" down the front of the pattern piece... 8+2+9 = 19"

Now measure across the width of the widest part of the headrest... let's say that measures 12". Add 1 3/4" to that to get 13 3/4" (that 1 3/4" addition is two 5/8" seam allowances and a bit for ease.

Cut two pieces like your wax paper pattern, and 1 piece 19"x 13 3/4" (change that to whatever you actually measure). Use a piece of cheap fabric similar in stretchiness and thickness to what you want to use. Sew the three pieces together using a 5/8" seam allowance. Try it on the headrest, seam allowances sticking out. Pin out any fitting changes you want to make. Mark a hem. Make sure you can put it on the headrest easily.

Transfer any changes you make to your pattern, cut and sew the "good" covers.

If this doesn't make sense, I'll sketch you up a schematic. Basically, you're making a tote bag without handles, with shaped sides, and then putting it upside down over the headrest.

Wax paper is great for capturing seam details when you have to make a pattern off of something already sewn. Keep a piece in your handbag when shopping, just in case you want to capture a pocket detail or such on ready to wear.

2008-08-22 09:42:32 by Beautifulmess120

Price: $15.95 $8.50

Hi,
We are about to embark on a cross-country trip, and just bought the Philips DCP951 for our daughter.
The dvd is part of the screen itself (access from the back). My question is simple: how can I mount it to the headrest? Without it, it is not clear to me how she can watch it... and this dvd has no "base".

Thanks!

go to walmart or hobby store or home depot ....etc..
they sell wide strips of velcro. one will glue itself to back of dvd. other can wrap around headrest for trip and you can easily take off when stoppping to avoid theft

2009-06-20 19:46:22 by badolina

Quickly installed and removed without any tools / Portable car to car!!!
HP TouchPad Tablet Car Headrest Mount!!!
Turns your car headrest into an en route movie theater!!!
Added engraved foam padding protects from scratches and adds No SLIP Texture!!!
360 degree rotation, Supports both portrait and landscape viewing!!!

I know they have these non slip surfaces that you can put anywhere on your car. It makes anything stay in place. MIne is on my dash but you can try it behindyour seat.

2007-01-09 18:11:07 by CC

We plan on driving from Illinois to Arizona in july with a three yr old and almost two year old. We would love to keep our sanity during the trip. Has any moms used these? they just strap on the back of the head rest and they can watch movies. I planned on buying them a bunch of movies they haven't seen yet :)

I have used these and they are a fantastic buy and well worth the money i can assure you. It keeps them amused for hours and they often fall asleep after an hour of watching them. I am in the uk so i can't really tell you where you could buy them from. alot of electrical stores over here sell them and also shops which sell car equipment. Have you tried ebay? you can always get a good deal there. x

2009-04-18 06:17:31 by OrionMomof3