Power In which situation would you tire more quickly?

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Presentation transcript:

Power In which situation would you tire more quickly?

Power

Notice that in the formula for work, it says nothing about time WORK = FORCE X DISTANCE

THE RATE AT WHICH WORK IS DONE Power THE RATE AT WHICH WORK IS DONE POWER = WORK DONE TIME UNIT: JOULE SECOND : WATT

Pit Pony

A little bit of history To find out how the power of his engine compared to that of a horse, James Watt measured how fast an average horse could do work. He found the answer and expressed the amount of work performed per second as a horsepower. A horse exerting 1 horsepower can raise 330 pounds of coal 100 feet in a minute. In the US we rate engines in terms of horsepower (hP) and electricity in watts (kilowatts, megawatts)

1 horsepower= 746 watts

What can a more powerful engine do? ONE OF 2 THINGS POWER = WORK DONE TIME 2X WORK OR WORK TIME ½ TIME

Practice Calculate the work done by both of you. You and your friend are getting paid by your neighbor to move 2- 500 N piles of soil to a garden that is 100 m away. You accomplished the task in 10 minutes, but your friend took 30 minutes. Calculate the work done by both of you. 2) Calculate the Power for each of you.

Practice A small motor runs a ski lift that pulls a group of children weighing 836 N to a height of 10.7 m in 23.2 s. What is the minimum power the motor must produce? 386 Watts

Practice You are helping your dad reshingle the roof. You carry 306 kg of shingles up the roof 7 meters from the ground in 1200 seconds. Calculate your power. 17.5 Watts

The second formula for power is... Power = Work = F•d = Time t A wagon weighing 1800 N is pulled by a horse at a speed of 0.40 m/s. What is the power of this horse? 720 Watts

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