In physics, "g-force" measures acceleration rather than a static speed like 100 mph. To determine the gs, you must know how quickly that speed was reached or the radius of a turn. For example, if a car accelerates from 0 to 100 mph in 3 seconds, it experiences approximately 1.52g. If a car is traveling at a constant 100 mph in a straight line, the g-force is effectively zero (excluding the 1g of Earth's gravity pushing down). However, if that same car takes a sharp turn at 100 mph with a radius of 500 feet, the lateral acceleration would be roughly 1.34g. In high-performance racing, drivers often sustain 4g to 5g during high-speed cornering, which feels like having four to five times your body weight pushing against you. Calculating these forces is vital for engineers to ensure that vehicles—and the humans inside them—can withstand the mechanical and physical stress of rapid changes in velocity or direction.