TIME MEASUREMENTS

Where is timing very important?

What are the different ways we measure time?

Scientific Method

History of Timing

Some societies do not need the minute and second.

Some societies go to the thousandth of a second and round to hundreths.

Galileo is said to have used his pulse to time a swinging chandelier in a cathedral.

Galileo is also said to have made a water clock. (1564-1642)

Galileo's Water Clock

Galileo's water clock worked like a stopwatch. To start the clock, he allowed water to flow into a container. To stop the clock, he stopped the flow of water. To reset the clock he emptied the container. By weighing the amounts of water in the container, he could then compare the times it took the ball to travel each distance. For example, if twice as much water (in weight) filled the container, he knew that the time measured was twice as long. (2)

Chinese Incense Alarm Clock

Hour Glass

Sumerian Sundial

Hour GlassHour Glass

Hour Glass

Hour Glass

Hour Glass

Egyptian Shadow Clock

13 Water Clocks Existed by 30 BC

Oldest Clock found in a tomb of Amenhotep I, buried around 1500 B.C.

Timing Water Events Phelps 7th Gold Medal: 100 m Butterfly

Omega finally releases Phelps photo sequence. Yahoo News. 8/24/2008

By ANDREW DAMPF, AP Sports Writer

(AP Photo/Omega)

2008 Olympics is Beijing

Photo Finishes Don’t Count Here

Phelps left in the 100-meter butterfly with Cavic Left

The Touch Pad Determines the Gold Medal Winner in Swimming.

Phelps Cavic

Phelps Has to Put 6.6 lbs of pressure on the touch pad first.

Phelps 50.58 seconds Calvic 50.59 seconds

Time at SanLee

BellsSecondsComputerStopwatch Counting: 1001, 1002,1003,1004

Citations

http://sports.yahoo.com/olympics/beijing/swimming/news?slug=ap-swm-phelpsphotofinish&prov=ap&type=lgns

(2) http://www.pbs.org/wgbh/nova/galileo/expe_inpl_2.html

Clock http://galileo.rice.edu/sci/instruments/pendulum.html

http://www.crystalinks.com/clocks.html