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work- force times distance.
work requires motion.
work depends on direction.
SI unit of work is joule.
power-rate of doing work.
SI unit of power is watt J/T
horsepower-work of a very strong horse
1hp=746 watts
machine- device that changes force.
machines make work easier.
-increasing force
-increasing distance
-changing direction
work done on a machine is less than work done by a machine cuz friction.
input force- work done on a machine.
input distance- distance input force act.
work input- work done by input force over input distance.
output force- force done by a machine.
output distance- distance output force is exerting.
work output- output force over output distance.
mechanical advantage- how many times the input force is increased.
actual mechanical advantage= output/input
ideal mechanical advantage= input dist./output dist.
friction makes MA not ideal.
efficiency = work output/ work input x 100
fulcrum- fixed point rotates around.
simple machine- changes output distance or force
-lever- rigid bar that is free to move around a fixed point
-1st class
-2nd class
-3rd class- MA is always less than 1
-wheel and axel-consists of 2 cylinders with different radius
-inclined plane- inclined surface that increases elevation distance/ height
-wedge- v shaped objects w/ 2 inclined plane
-thinner wedges have greater MA
-screw-inclined plane wrapped around a cylinder
-closer threads have greater MA
-pulley- rope that fits into a groove into a wheel
-moveable pulley- attached to object
-pulley system- combining moveable and fixed pulleys
compound machines- 2 or more simple machines not together.
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