GLEs: 1.2.1. Analyze how systems function, including the inputs, outputs, transfers, transformations, and feedback of a system and its subsystems. 1.2.2. Analyze energy transfers and transformations within a system, including energy conservation.
Lesson: Complete Pulley Lab 3 on efficiency. [Last class students built fixed and moveable pulleys] Build block and tackle with 3 supporting ropes and one with 5 supporting ropes. For each pulley, measure and record: effort force and distance, and resistance force when you are lifting the resistance a distance of 12 inches every time.
Assignment: Students copy down all 4 pulley diagrams on clean sheet and calculate work (in) and work (out) and efficiency for every pulley diagram.