Work, Power & Mechanical Advantage
Work, Power & Mechanical Advantage
Work, Power & Mechanical Advantage
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<strong>Work</strong>, <strong>Power</strong> &<strong>Mechanical</strong><strong>Advantage</strong>
<strong>Work</strong>•When a force causes an object to movein the some direction when force isapplied.
<strong>Power</strong>•A 60 Watt lightbulb usesenergy at therate of 60 wattsor joules persecond•Electriccompanies usethe unitkilowatt hours(kWh) tomeasureenergy.
<strong>Power</strong>•<strong>Power</strong> producedby engines ismeasured inhorsepower (hp)1hp = 746W
<strong>Power</strong>•<strong>Power</strong> is the rate at which work is done•The unit of power is the Watt = 1Joule/secondThe formula:WP T<strong>Power</strong>(W) =<strong>Work</strong> (J)Time (s)
<strong>Work</strong> & Energy•An object inmotion has morekinetic energy (KE)than potentialenergy (PE)
Machines•Machinesmake workeasier.•Machines doNOT decreaseamount ofwork required.
Simple Machines•A simple machineis any device thatdoes work withthe application ofa single force.
<strong>Mechanical</strong> <strong>Advantage</strong>•In physics andengineering,mechanicaladvantage (MA) isthe factor by which amachine multipliesthe force put into it.The Formula:MA=output forceinput force
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