Simple Machines

1. Simple Machines levers inclined plane wheel & axle wedge screw pulley

2. a solid bar that rotates around a fixed point, or fulcrum. Definition: makes work easier: examples: Definition: Makes work easier: A sloping surface or ramp changes direction or size of force 1st class lever: examples: 2nd class lever examples: 3rd class lever examples: Increases distance and decreases force bottle opener wheelbarrow see-saw crowbar scissors tweezers staple remover bat picture picture Ramps on moving trucks, handicapped ramps, slide, picture size & direction greater output decdist/inc. out speed definition: makes work easier: examples: definition: makes work easier: examples: A simple machine with a thick end and a thin end; used to cut, split, or pierce objects. An inclined plane that moves. Definition: a wheel attached to an axle (stick) Changes the size of the force by increasing the distance. Let students turn the axle of a doorknob. Apply input force over a larger area to decrease the amount of force you have to put in. steering wheel, doorknobs, screwdriver, fan Doorstop, chisel, ice scraper, ax, knife, a wheel with a grooved rim and a rope that rides in the groove def: makes work easier: definition: makes work easier: examples: An inclined plane wrapper around a post change direction (fixed), reduce size of force fixed pulley moveable pulley block & tackle Increases distance, decreases input force Lid of a jar, drill, screw, spiral staircase