Study of free fall in Physics lessons in the Hight School from a time marker and Science History

It has already been studied and there is already a consensus among researchers in Science Teaching, that experimental activities are very important for the teaching and learning process of scientific concepts, however, are also known to the multiple and varied difficulties faced by teachers In developing them in real classroom situation with their students. Research has also shown to be significant the contributions that the History of Science can bring to the work of the science teacher in planning and directing didactic activities in the classroom. In this work, we propose a version of a low cost and easy construction time marker for the determination of the local gravity acceleration and the use of the History of Science as an important resource to the teacher for the planning of discussions with the students on the movement of free fall.