Grades 1-2 Video Solutions 2021-video 2021 1-2/20

Video Transcription

Video Summary

The problem involves determining the position of black teeth on two interconnected gears after one full turn of the smaller gear. The small gear has 8 teeth, and the larger gear has 16 teeth. When the small gear completes one full rotation, moving its black tooth back to the starting position, the larger gear moves 8 teeth in the opposite direction due to their gear mechanism. This displacement is half the number of the larger gear's teeth, meaning the black tooth on the larger gear ends up directly opposite its starting point. Therefore, the correct answer, where the black tooth aligns, is position C.

Keywords

gear mechanism

tooth position

gear rotation

gear alignment

black tooth