Simple machines
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SIMPLE MACHINES. 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. FIRST CLASS LEVERS.

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SIMPLE MACHINES

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SIMPLE MACHINES


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.


FIRST CLASS LEVERS

fulcrum located between points of application of input and output forces.

seesaw


SECOND CLASS LEVERS

  • fulcrum is at one end of arm and input force is applied to other end.

  • wheelbarrow


THIRD CLASS LEVERS

  • multiply distance rather than force.

  • have a mechanical advantage of less than 1.

  • arm


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


PULLEYS


WHEEL & AXLE

a lever or pulley connected to a shaft.

steering wheel of a car, screwdrivers, and cranks


THE INCLINED PLANE FAMILY

multiply and redirect force.

turns small input force into large output force by spreading work out over a large distance.


SIMPLE INCLINED PLANE

Changes both magnitude & direction of force


WEDGE

Functions as two inclined planes back to back.

Turns single downward force into two forces directed out to sides.


SCREW

an inclined plane wrapped around a cylinder.


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


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