My sister did it by punching a windshield while wearing a ring. She wasn't trying to break it, just get her boyfriend's attention. It worked I think. All his friends were around and they started treating her like she was all tough because of it.
/funny story off
Moral of the story--a moderate force concentrated on a small area can produce enough pressure to crack windshield glass.How can you break a car window with a small object?
an automatic center punch will do it quickly %26amp; quietly.
Take a steel ruler and hit your car window with the flat of it, hard as you like. It probably won't break it. Now hold it like a knife and firmly whack it with a protruding point or edge. The first could have you hitting the window all day, the second will quite possibly give you a first-attempt break. The difference is that you have spread all the energy over a large area, or all the energy into a single point, and that difference is what makes the difference.
This works with soft objects too - it's just a law of nature. For example, to draw on 20 years' experience as an Addiction Counsellor, when I used to ask clients what they did when the needles got so blunt they would barb on attempting to penetrate skin, like, how did they get their 'hit'. The answer was uniform and seldom varied in any detail: just straighten out the most recent barb on the side of some sandpaper or side of a matchbox. Take a deep breath and insert as hard and fast as possible - almost like throwing a dart. In 99% of such attempts the needle would enter the targetted vein and it would exit again after performing its function without the painfulness of having been barbed again and having to draw the barb out backwards (it makes a clicking, rending sound as it tears through the tissue like the teeth of a comb, makes drawing fingernails down a blackboard seem like a desirable and fun sensation by comparison, I'm told, and with added physical pain to boot).
Of course, what they were doing was applying the most amount of pressure in the shortest time with the smallest area projectile, and the skin was not offering any resistance, or didn't have the opportunity, as with a bullet at speed. Interested, I asked for one of a client's worst needles, and experimented a bit with cardboard sheets. Provided you fulfilled the above conditions, you could add sheets to the length of the needle (get a longer one and it would still pierce right through, like a dart thrown accurately and with great force). The comments about bullets in some of the answers further bear this out - in fact, without this principle, back in days of yore, our spears would just have bounced off dem buffalo etc, and we probably would never have evolved into two dudes (or dudettes) shooting the breeze about laws of physics. Hope this helped a little.
you can definitely break a window by punching it.....but it hurts like hell when glass shards go in your arm
it's not how big but rather how much force. a larger force exerted over a smaller or sharper objects has a huge impact. it's almost similar to a small bullet having so much energy
a broken spark plug will do it, get the porcelain part and throw it at a car window and it shatters.
Shoot it with a bullet? LOL!
Car windows are made of ';tempered';, or ';heat treated'; glass, for two reasons. Tempered glass is 2 to 6 times stronger than normal, and when it does break, it shatters into hundreds of small chips instead of a few large razor sharp shards (this is called ';dicing';)
Tempered glass is made by heating a glass sheet to about 1200 or more degrees, then *rapidly* cooling the sheet with a blast of cold air until it is down to about 300 or 400 degrees. This causes a huge amount of thermal strain on the surface of the glass, which in general makes it much more able to resist bending and impact forces.
However, if you use any material that is *harder* than glass, such as a diamond, or a sharp piece of porcelain, and make a small scratch or chip, the thermal strain is strong enough to literally tear the surface of the glass apart at the weak point.
The resulting crack then ';propagates'; into the middle of the glass, and from there, multiplies and ';spiderwebs'; through the entire pane at supersonic speed, causing it to literally ';explode'; into hundreds of fragments. The fact that it shatters into uniform sized pieces is actually a sign of a good product.....
The key here is not necessarily how much force you use, but how *hard* the object is; any glass will break if bent or impacted with enough force, no matter what you use....
Probably more than you wanted to know....
~Soylent Yellow
P.s: The front winshield of cars is usually made out of ';laminated safety glass'; which is completely different....
hit the object in the center of window with a large force. be away with the window for some distance while hitting.
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