10Simple Machine – Third Class Effort Force is between the Resistance Force and the fulcrumResistance and Effort Forces are in same directionExamples: Broom, Shovel, Fishing Pole, Baseball Bat, and Tongs
16Simple Machine - ScrewForm of an Inclined Plane wrapped in a spiral around a cylindrical post to fasten thingsTwo parts: Body and ThreadExamples: Drill Bits, Jackscrew, Fan Blades, Propellers, Screw, Nuts & Bolts
18Simple Machine – Wheel and Axle Wheel connected to a rigid poleModified Lever and center of axle serves as FulcrumExamples: Door Knobs, Handle Bars on Bike, Wheels on car, Roller Conveyor
19Simple Machine – Wheel and Axle Gears are modified forms of Wheel and AxleWheel has teeth along circumferenceEffort Force exerted on larger gear to turn the smaller gearExamples: Bike Sprockets, Can Opener, Machine Gears
21Simple Machine - Pulley Grooved wheel turning around a fulcrum to lift heavy objectsRope or Chain used in grooveCan be fixed, movable, or combination of bothExamples: Flag Pole to raise Flag, Hoisting a Sail, Open Curtains or Mini Blinds,
22Work Defined as a Force acting through a distance W = F * d Measured in Joules (J) after British Scientist James Prescott Joule
23Work Work is done only when Object moves, and Object’s motion is in the direction of applied ForceHow does a Simple Machine make Work easier?