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　　Drift, drifting is a racing term. It refers to a series of operations in which the direction of the front of the car and the actual movement direction of the car body create a larger angle so that the car body slides into a bend.

　　When the rear wheel loses most of the grip while the front wheel can maintain the grip (at most only a small part is lost, it is best to gain extra grip), as long as the front wheel has a certain amount of lateral force, the car will flick, You can drift.

　　Drift corners are the same as normal corners. They have a speed limit, and the speed limit of drifting corners can only be higher than that of ordinary corners. The speed limit of drifting corners on hard ground is lower than that of ordinary corners!

　　As for the final flick, it is related to the friction coefficient between the tire and the road surface, the speed of the car, the braking force, the size of the throttle, the angle of the front wheel, the weight distribution of the car, the wheelbase and the suspension softness and hardness and Smart tire repair and inflation. For example, it is easy to flick the tail when driving on the rainy or snowy ground, but it is more difficult if it is not; the higher the driving speed, the easier it is to flick the tail (so the first thing to do in safe driving is not to drive fast); the fast direction is also easy to flick the tail (Don't turn the steering wheel too fast); the smaller the wheelbase and the higher the body, the stronger the weight transfer, the easier it is to flick the tail (also easy to roll over!); the weaker the anti-roll effect of the front suspension system, the easier it is to flick the tail.

　　The games are (finally) underway in Tokyo, and for the next two weeks, we'll witness the greatest display of sport physics at work.

　　After a year-long delay (and what a year it was!), the Tokyo Olympics are here finally here. For two weeks, the world's best athletes will put on incredible displays or skill, fortitude, stamina, and physics. Yes, physics.

　　To be the very best, athletes break down their sport to a science. Momentum is translated to joules, runners understand the intricacies of different muscle fibers, kayakers deftly navigate the math behind fluid dynamics. Here we break down some of the interesting science that'll be on display in the next two weeks.

　　Much has been written about the superhuman athletic ability of swimmer Michael Phelps. He’s a genetic wonder, built like a fish, with hands and feet like canoe paddles. All this is true—it is impossible to win at the Olympics without a genetic predisposition to your sport. Team USA at the Tokyo 2020 Olympic Games will be hoping to surpass—or at the very least imitate—what made Phelps a swimming phenomenon.

　　Body: Phelps’s body is a famously specialized swimming machine. His wingspan, at 6 ft. 7 in., is 3 in. longer than his height. And his long torso and relatively short legs—he has an inseam of 32 in.—let him ride high in the water.

　　Biochemistry: Strokes such as the butterfly tend to build up lactic acid in muscles, reducing their ability to perform. Phelps’s exact numbers are kept secret, but tests suggest that he naturally produces far less lactate than most athletes do.

　　Flexibility: Some sports require strength (shot put); others, flexibility (gymnastics). Swimming requires both. Phelps’s flexible elbows, knees, and ankles allow him to move through water with minimal resistance.

　　Hydrodynamics: In a 200-meter freestyle race, a swimmer moving at 3.8 mph expends 290 kilojoules fighting his own drag. To combat this, Phelps adopted a streamlined swimming posture—head down, hips high.

　　Technique: Phelps was the master of the dolphin kick. By pushing off the wall and whipping his legs, he can swim faster than with a traditional stroke—gaining an advantage of half a body length over competing swimmers.

　　Training: Phelps trained every day of the year—4 hours in the pool, 1 hour on dry land. Since swimmers can burn about 1,000 calories per hour, Phelps’s diet tended to be relatively high in carbohydrates to avoid glycogen depletion.