Presentation on theme: "By: Logan Stadel. Table of Contents Levers Three Classes of Levers Wheel and Axle Inclined Plane Wedge Screw Pulley More on Pulleys Works Sited."— Presentation transcript:
By: Logan Stadel
Table of Contents Levers Three Classes of Levers Wheel and Axle Inclined Plane Wedge Screw Pulley More on Pulleys Works Sited
Lever How it works: A free bar that is free to move around a fixed point. The fixed point the ball rotates around is the fulcrum. Mechanical Advantage: Divide that input arm by the output arm
Three Classes of Levers First-Class Lever- used to open paint cans the fulcrum is the inside edge of the paint can Second-Class Lever- the output force is located between the input force and the fulcrum Third-Class Lever- the input force is located between the output force and the fulcrum These classes are based on the locations of the input force, the output force, and the fulcrum. 1 st class Lever 2 nd Class Lever 3 rd Class Lever
Wheel and Axle How it works: A simple machine that consists of two disks or cylinders that, each one with a different radius. Mechanical Advantage: Divide that radius where the input force is exerted by the radius where the output force is exerted. Can have a mechanical advantage of one or less than one. Example: A steering wheel
Inclined Plane How it Works: A slanted surface along which a force moves an object to a different elevation. Mechanical Advantage: The distance along the inclined plane divided by its change in height. Example: The ramp that makes it easier to lift a refrigerator easier to lift into a truck.
Wedge How it Works: A V-shaped object whose sides are two inclined planes sloped toward each other. Mechanical Advantage: A thin wedge of a given length has a greater mechanical advantage than a thick wedge of the same length. Example: A sledgehammer that splits wood apart
Screw How it works: An inclined plane wrapped around a cylinder. For two screws of the same length, the one whose threads are closer together moves foreword less for each turn of the screw. Mechanical Advantage: Screws that are closer together have a greater ideal mechanical advantage. Example: Nuts and bolts
Pulley How it works: A simple machine that consists of a rope that fits into a groove in a wheel. They produce an output force that is different in size, direction, or both, from that of the input force. Mechanical Advantage: Equal to the number of rope sections supporting the load being lifted. Example: Moving large fabricated parts in factories.
More About Pulleys Fixed Pulleys: * A fixed wheel attached in a fixed location. * Only able to rotate in one place * The direction of the exerted force is changed by a fixed pulley, then the rope lifts the load up as far as you pull down the rope Moveable Pulleys:Moveable Pulleys: * Attached to the object being moved rather than to a fixed location. * If you are pulling on the rope on the right with a force of 10 N, the both sides of the rope pull up with the same force of 10 N. Pulley System: * Combining fixed a moveable pulleys into a pulley system, a large mechanical advantage can be achieved * Consists of four segments of supporting rope, ignoring friction all four segments supply a lifting force as strong as the force you exert on the rope. Making the output four times greater than the input force.
Compound Machine How it works: A combination of two or more simple machines that operate together. The output force on one simple machine becomes the input force for another machine. Mechanical Advantage: The sum of all the mechanical advantages of all the simple machines Example: Clock Inside of a clock
Works Sited erStock_1613R jpghttp://wwwdelivery.superstock.com/WI/223/1613/PC/Sup erStock_1613R jpg baby.de/family/sarahreith/images/demian/wheelbarrow.jp ghttp://www.rund-ums- baby.de/family/sarahreith/images/demian/wheelbarrow.jp g %20SWEEPING%20FLOOR.jpghttp://www.celinesmusic.com/images/SHE%20WORKS %20SWEEPING%20FLOOR.jpg r.gifhttp://www.lkwdpl.org/schools/elempath/machines/banne r.gif jpghttp://images.inmagine.com/168nwm/corbis/crb128/crb jpg