Examine a set of three gears that drives a conveyor belt to an oven. Notice that the number of rotations for each gear depends on the gear size (number of teeth). Explore the relationship between the number of teeth and the number of rotations. Compare rotations for a range of gear sizes. Look for a pattern in the number of rotations of the gear wheels. Choose a gear to adjust the speed of a conveyor belt. For example, choose a gear size (40 teeth) that will turn twice for every turn of the first driver gear (80 teeth), and once for every turn of the second driver gear (40 teeth). This learning object is the fifth in a series of six objects that progressively increase in difficulty.
Objective
1. Students use knowledge of factors and multiples to solve problems.
2. Students apply ratios to solve multiplicative problems.
