![]() This dummy, whose name is "Adam," doesn't test crash responses: he's designed to sweat like a real person so researchers can test the climate conditions inside a car! Photo by Warren Gretz courtesy of US Department of Energy/National Renewable Energy Laboratory (DOE/ NREL). Photo: A typical crash-test dummy has over 130 different sensors packed inside. That's important: if the bag didn't deflate, your head would just bounce back off it and you'd be no better off. The basic idea is that the airbag inflates as soon as the car starts to slow down in an accident andĭeflates as your head presses against it. ![]() Replace them (relying on an airbag to protect you without fastening The word "supplementary" here means that theĪirbag is designed to help the seatbelts protect you rather than Steering wheel or the glass windshield (windscreen).Īs a supplementary restraint system (SRS) or supplementary Physics says your head will keep on going and smash into the Your head weighs a surprising 3–6kg (6–12lb)-as much as several bags of The biggest problem is that they restrain only your body. Have had seatbelts for decades, but they're a fairly crude form of On moving until something (a force of some kind) stops them. Newton who first stated it) that things that are moving tend to keep Newton's first law of motion, after brilliant English physicist Sir Isaac Moving car have mass and velocity too and, even if the car stops, Violent the collision, and the greater the chance you'll be injured or killed. If a collision brings your car to a halt in a certain time, the more energy you have, the more The more kinetic energy you have, the more you need With the square of your speed (your speed × your speed). That's because your kinetic energy increases Even though cars are designed to crumple up andĪbsorb impacts, their energy still poses a major risk to theĬhart: The faster you go, the harder it is to stop. ![]() To stop-or until you crash into something. The faster you're going, the more kinetic energy it has. Kinetic energy, and the heavier your car and (loosely, this is the same thing as speed, but strictly it means "stuff" an object contains and it's closely related to how heavy it ![]() Car crashes are controlled by the laws of physics-and, more specifically, theĪnything that moves has mass (very loosely speaking, this means how much ![]()
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