AIM: ? OBJ: Given notes and activity sheet SWBAT with 70% accuracy DN: ACT: HW: Simple Machines Wheel & Axle: two circular/cylindrical objects that are connected together and rotate around a common axis, where: Wheel: larger radius object Axle: smaller radius object Example: screwdriver, door knob, steering wheel MA (wheel&axle) = wheel radius axle radius Simple Machines Pulley: a grooved wheel with a rope (cable) wrapped around it. Types of Pulleys: 1] Fixed Pulley: pulley attached to a structure (ceiling, wall). F i = F o, change in direction; MA = 1 2] Movable Pulley: pulley attached to moving object. increase F o, no change direction; MA = 2 3] Block & Tackle: fixed & movable pulley system. increase F o, no change direction; MA = 3 Fixed Movable Block & Tackle ignore (F z ) cord MA = 1 MA = 2 MA = 3 MA = 4 Simple Machines Compound Machine: a combination of two or more simple machines.