CAJ | 학술논문

我国教材要求学生用动量守恒定律理解火箭升空原理，然而又没有考虑火箭重力与空气的阻力。在对火箭获得速度的求解公式说明时，又把火箭在极短时间内喷出的微量燃气，当作火箭发射整个过程中喷出燃气的总量，以致出现用教材中的数据套用教材的公式计算火箭获得的速度与实际情况大相径庭。美国教材要求学生从力的有关知识理解火箭升空原理，配有原理图，显得生动活泼，浅显易懂。
아국교재요구학생용동량수항정률리해화전승공원리，연이우몰유고필화전중력여공기적조력。재대화전획득속도적구해공식설명시，우파화전재겁단시간내분출적미량연기，당작화전발사정개과정중분출연기적총량，이치출현용교재중적수거투용교재적공식계산화전획득적속도여실제정황대상경정。미국교재요구학생종력적유관지식리해화전승공원리，배유원리도，현득생동활발，천현역동。
Our textbook requires students to understand rocket launching with the law of conservation of momentum ,and ignore rocket gravity and air resistance .At the same time ,when we exlpain the formula that rocket gains speed ,we think of the finite gas the rocket erupts as the total amount of gas .Because of this ,when we calculate rocket speed obtained with the formula in the book ,the result makes a great difference from the fact . American textbook requires student to understand rocket launching with the knowledge of force and gives illustrative diagram ,which makes it lively and easy to understand .