Fourth graders study about the invention of tools to solve problems. They determine how people use simple machines to solve problems. They learn that simple machines make work easier. They may build their own machines using pulleys, gears, wheels, axles, chains and ropes. Fourth graders build an understanding of electricity and magnetism.
Fourth graders learn about electric circuits and their ability to produce light, heat and sound.
They analyze the parts of a light bulb. Magnetic effects over distance or through various substances are studied. There are other topics that fourth graders study in science class. Fourth graders also study about minerals and the composition of rocks. Students assess the uses of rocks and minerals and devise rules for classification.