Glass is pretty intense if you apply a force spread over a large surface. But it will crack. If the force is in concentration; such as by getting hit by something small and hard like the mini safety hammer. It also has low fracture toughness, so if a crack gets started, it doesn’t take much force to make the crack grow.
Was there any indication of which car windows were getting cracks? The front windshield would be due to rocks thrown up by truck tires. Side or back windows could be due to punks using slingshots. The latter case happened in LA many years ago. There is a tool. A spring-loaded punch that, when pressed against a side window will shatter the glass.
Get To Know About The Mini Safety Hammer And other Tools
There is also a “hammer-like” safety tool that can be useful for shatter side glass and also cut away from seat belts. This works on the most side and rear windows. Which, I believe, are “tempered-glass”.
This does not work on the windshield, which has a plastic layer in the middle of the glass. (I realize this sentence may get responses further clarifying how a windshield is to make, but if you have seen a damaged windshield, you will see how there is a safety layer in the construction to prevent shattering.)
How To Shoot It?
If you are inside or outside, the quickest way is to shoot it, unless you consider a gun to be a tool, and if you do, we can have an entirely different discussion! Since my first response was not helpful. Let me ask, what do you consider a tool? Is a brick a tool, is a rock a tool, is a stick a tool?
Unless you have extraordinary mental powers that allow you to “will” the glass to break (which is probably also a tool by definition), you are out of luck! In the time/space world in which we live. Anything you can imagine or use to break the glass is considered a tool, so you may want to restate your question!
Other Ways To Break The Glass Windows
I think you should investigate trucks with open trailers trucking sand with pebbles or small rocks, or just stones.
A rock falling from seven feet isn’t going to do much damage, but a foundation going ten meters per second is sure to crack some glass. Now, it can either happen while driving behind a truck on a highway or, (Second reason Round rocks and pebbles(is this lousy spelling?) Can be ‘shot out’ by truck tires and some low profile car tires. By driving over them with the edge of the tire. The rocks can slip out sideways. But under the weight of the truck and tension of the rubber, they get ‘snapped’ out.
So, you may have lots of small round rocks on your roads out of any reason. And there can cars park in driveways about 20 – 30 feet away from the way. You only need an edged-tire-heavy-vehicle to pass by once and \\shoot your windshields with rocks.