SIMPLE MACHINES
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Transcript of SIMPLE MACHINES
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SIMPLE MACHINES
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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.lever family: inclined plane family:
simple lever (3 types)
simple inclined plane
pulley wedge
wheel and axle screw
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FIRST CLASS LEVERS
fulcrum located between points of application of input and output forces.
seesaw
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SECOND CLASS LEVERS
• fulcrum is at one end of arm and input force is applied to other end.
• wheelbarrow
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THIRD CLASS LEVERS
• multiply distance rather than force. • have a mechanical advantage of less than 1.• arm
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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
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PULLEYS
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WHEEL & AXLE
a lever or pulley connected to a shaft.steering wheel of a car, screwdrivers, and
cranks
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THE INCLINED PLANE FAMILY
multiply and redirect force.turns small input force into large
output force by spreading work out over a large distance.
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SIMPLE INCLINED PLANE
Changes both magnitude & direction of force
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WEDGE
Functions as two inclined planes back to back.
Turns single downward force into two forces directed out to sides.
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SCREW
an inclined plane wrapped around a cylinder.
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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
Chapter 12