一、教学目标科学概念:1.像搭在汽车车厢上的木板那样的简单机械,叫做斜面。2.斜面能省力3.坡度越小越省力过程与方法:1.能够对斜面与拉力关系提出假设、设计实验、观察记录等。2.能够搜集数据并发现斜面坡度大小与拉力变化的规律。情感、态度与价值观:1.对科学研究有兴趣,体验和感受到生活中时时处处有科学。2.体验到亲历科学探究过程的乐趣。3.关注身边的简单机械的应用。二、教学重难点 First, the teaching objectives Scientific concepts: 1. Like a wooden board mounted on the car that simple machine, called the bevel. 2. Bevel energy 3. Less slope more labor-saving processes and methods: 1. Be able to assume the relationship between the ramp and tension assumptions, design experiments, observation records. 2. To collect data and find the slope gradient and the size of the law of change. Emotions, Attitudes and Values: 1. Being interested in scientific research, experiencing and feeling that life is always science. Experience the fun of going through the scientific inquiry process. 3. Concerned about the simple mechanical applications around. Second, teaching heavy and difficult