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本节课为小学科学五年级上册第二单元《光》第一节,题为《光与影》。本单元让学生探究光的传播特点(路径、反射)、光照强弱和温度的关系,并在前面研究的基础上让学生自主设计制作太阳能热水器。本节课引出两个科学概念:影子产生需要光源、遮挡物和接光屏;影子的变化规律,物体距离光源越近影子越大、入射光线越倾斜影子越长且影子总在背光一侧、物体接受光的角度不同影子的形状不同。其中,探寻影子变化规律、了解入射光线越倾斜影子越长且影子总在背光一侧是本课探究的重点。
This lesson is the first section of “Light”, the second unit of the fifth grade of elementary school, titled “Light and Shadow.” This unit allows students to explore the light propagation characteristics (path, reflection), the relationship between light intensity and temperature, and in the previous study based on the students to design their own solar water heaters. The lesson leads to two scientific concepts: shadow generation requires light sources, shelters and then light screen; shadow changes, the closer the object from the light source the greater the shadow, the more inclined the incident light Shadow longer and shadow always in the backlight side, The angle of the object to accept light Different shades of different shapes. Among them, to explore the law of shadow changes, understanding the more inclined the incident light, the longer the shadow and shadow on the backlight side is the focus of this lesson.