论文部分内容阅读
恰当地运用物理规律解题,不仅可以使解题过程得到简化,而且还会节约很多时间,因此同学们在平时的学习中,就要有意识地培养自己运用物理规律解题的能力。在运用匀变速直线运动的规律解题时,对于不符合运用物理规律解题条件的,有时可以创造条件,使其满足规律,从而达到运用规律进行解题的目的。例1汽车以20 m/s的速度做匀速直线运动,刹车后的加速度为5 m/s~2,那么开始刹车经过2 s与开始刹车经过6 s汽车通过的位移之比为()。
Appropriate use of physical laws to solve problems not only can simplify the problem-solving process, but also save a lot of time, so students in normal learning, we must consciously develop their ability to use the laws of physics to solve problems. When using the law of uniform linear motion to solve the problem, for those who do not meet the conditions of solving the problem with the laws of physics, and sometimes can create the conditions so that they meet the law, so as to achieve the purpose of using the law to solve the problem. Example 1 The car is moving at a uniform linear velocity of 20 m / s. The acceleration after braking is 5 m / s ~ 2. The ratio of the displacement of the vehicle after 2 seconds has elapsed from the start of braking to 6 seconds after the start of braking is ().