Understanding Structures and Mechanisms, Pulleys and Gears

3.1 describe the purposes of pulley systems and gear systems (e.g., to facilitate changes in direction, speed, or force). ▹
3.2 describe how rotary motion in one system or its components is transferred to another system or component in the same structure. ▹
3.3 describe how one type of motion can be transformed into another type of motion using pulleys or gears (e.g., rotary to linear in a rack and pinion system, rotary to oscillating in a clock pendulum). ▹
3.5 distinguish between pulley systems and gear systems that increase force and those that increase speed. ▹
3.7 explain how the gear system on a bicycle works (e.g., by using the largest gear on the front chain ring and the smallest gear on the rear wheel, we can move quickly along a flat surface). ▹
3.8 identify the input components that drive a mechanism and the output components that are driven by it (e.g., the pedals on a bike are the input component; the rear wheel is the output component). ▹