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SIMPLE MACHINES

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  1. SIMPLE MACHINES

  2. THE LEVER FAMILY simple machines One of six basic types of machines which are basis for all other forms of machines. have a rigid arm and a fulcrum. six types divided into two families.

  3. FIRST CLASS LEVERS fulcrum located between points of application of input and output forces. seesaw

  4. SECOND CLASS LEVERS • fulcrum is at one end of arm and input force is applied to other end. • wheelbarrow

  5. THIRD CLASS LEVERS • multiply distance rather than force. • have a mechanical advantage of less than 1. • arm

  6. PULLEYS • modified levers. • point in middle of a pulley is like fulcrum of a lever. • single, fixed pulley has a m. a. of 1. block and tackle: • Multiple pulleys working together

  7. PULLEYS

  8. WHEEL & AXLE a lever or pulley connected to a shaft. steering wheel of a car, screwdrivers, and cranks

  9. THE INCLINED PLANE FAMILY multiply and redirect force. turns small input force into large output force by spreading work out over a large distance.

  10. SIMPLE INCLINED PLANE Changes both magnitude & direction of force

  11. WEDGE Functions as two inclined planes back to back. Turns single downward force into two forces directed out to sides.

  12. SCREW an inclined plane wrapped around a cylinder.

  13. Chapter 12 COMPOUND MACHINES • machine made of more than one simple machine Examples : scissors • two first class levers joined at a common fulcrum car jack • combination of lever with a large screw