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Simple MACHINES

Simple MACHINES. By: Sara Leach, Shirley Liu, Josh Stephenraj , Natalie Rose Http://www.youtube.com/watch?v=lloacU_zJA. Table of Contents. Screws Lever Wedge Pulley Wheel and axel Inclined plane. Screws. A simple machine that everybody uses!. What’s a screw?.

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Simple MACHINES

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  1. Simple MACHINES By: Sara Leach, Shirley Liu, Josh Stephenraj, Natalie Rose Http://www.youtube.com/watch?v=lloacU_zJA

  2. Table of Contents • Screws • Lever • Wedge • Pulley • Wheel and axel • Inclined plane

  3. Screws A simple machine that everybody uses!

  4. What’s a screw? • One of the simple machines. • A cylinder with an inclined plane wrapped around it. • A shaft with a helical groove or thread formed on it’s surface.

  5. Examples of screws: • Jar lids • Light bulbs • Stools • Key ring • Spiral staircase

  6. Types of screws: • Countersunk slotted- a tradition screw with a long shank. Widely used, most suitable for traditional pieces. • Countersunk cross head- most popular type of screw because the cross-shaped slot tends to prevent the screw driver from slipping.

  7. Types of screw cont. • Roundhead- used mostly for fixing items. Top is rounded and sits out from surface. • Raised head- top is slightly rounded. Commonly used for fitting ironmongery, such as door handles. • Mirror screw- commonly used for fixing mirrors. A dome shaped chrome cover is then fastened into the top screw.

  8. Wedge • Shaped like an inclined plane, but it is really a moving inclined plane. • A wedge has one wide end and one small end. • With a very weak force applied to the larger end all the force will move to the tip of the small end and move an object. • A wedge can also be round

  9. The Wedge and The Lever Simple Machines

  10. Facts About the Wedge! • The Wedge is shaped like an inclined plain but it is really a moving inclined plane • It has one thick end and one thin end • A wedge can be round like the top of a nail • If you have a wedge that is very thick on the larger side then the wedge will work better

  11. How Does a Wedge Work If apply a weak force to the thicker side of the wedge then the force applied will the move to the thin end of the wedge and the same amount of force will be in a smaller area so it would be stronger than if you used the thick side…. Which wouldn’t work.

  12. Examples of the Wedge • Nail • Door stopper • Fork • Ax • Zipper • Knife

  13. Facts About the Lever A Lever is a rigged object that pivots about a fixed point The Lever is used to lift weights The lever has a bar that is supported at one point along the length of the bar Fulcrum – the fixed point at which a lever pivots There is always a Fulcrum on a lever

  14. Uses of the Lever • Wheel barel • Nut Cracker • Bottle openers • Fishing poles • Shovels • Baseball bats • Seesaw • Scissors

  15. By Natalie Rose

  16. WHAT THE PULLEY IS USED FOR The pulley is used for lifting objects that are to heavy for a human to lift. It is also for lifting things up high.

  17. Types of pulleys • A crane • A pulley

  18. Important facts about the pulley • The more pulleys you have the easer it is to lift heaver objects. • Archimedes was the inventor of the pulley. • The weight is spread out in each pulley

  19. Uses for the Pulley • There are many uses for the pulley the main and most important one would be it helps people lift heavy objects. Also it brings objects.

  20. Wheel and Axel We use it in everyday life!!

  21. How does it work? • Wheel and axel works together by rotating in a circle.

  22. What is a wheel and axel? • A lever that rotates in a circle around a center point of fulcrum. • Can also have a solid shaft with a center core as the axle. • Made of a large wheel secured to a smaller wheel called an axle.

  23. Examples of wheel and axel: • Bicycle wheel • Ferris wheel • Gears

  24. Bibliography: • http://www.usoe.org/curr/science/sciber00/8th/machines/sciber/machine7.htm • http://images.google.com/images?hl=en&q=wheel+and+axel&gbv=2&ie=UTF-8&um=1&sa=N&tab=wi • http://en.wikipedia.org/wiki/Pulley

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