美式橄榄球球员都是些块头大、身体沉的家伙,不过他们却一点也不笨重——他们能够以接近3 2千米/小时的速度撞击地面。他们知道,跑得越快,撞得就越重,所以他们像肉做成的铁锤一样,拼命冲向拦截他们的对手。撞击时产生的冲击力由质量乘以加速度决定。因此,体重与速度相结合就能够产生强有力的、令人难以忍受的力量。 American football players are big, sluggish guys, but they are not bulky at all - they hit the ground at nearly 3.2 km / h. They know that the faster they run the harder they hit, so they fiercely rush to intercept their opponents, just as the meat-made hammers do. The impact force when impacting is determined by the mass multiplied by the acceleration. Therefore, the combination of weight and speed can produce a powerful, unbearable force.