Introduction parachute history The first known written account of a parachute concept is found in da Vinci's notebooks (cl495). The sketch he drew consisted of a cloth material pulled tightly over a rigid pyramidal structure. Although da Vinci never made the device, he is given credit for the concept of lowering man to the earth safely using a maximum drag decelerator. Fauste Veranzio constructed a device similar to da Vinci's drawing and jumped from a tower in Venice in 1617. in 1797, Andrew Garnerin made the first jump with a parachute without a rigid frame. One of Garnerin's balloon jumps from 8000 feet, a very high altitude for the time, was observed by a French astronomer, Lalande.

Methods to test parachute There’s a lot of ways to test a parachute For example : Shape of the parachute Material of the parachute Length of strings Layers of parachute Position of string attachment points Number of strings

Introduction our group Hi everyone this is group 3 from class 2B The members are Mariz (29) Cindy (26) Hensa (13) Sonwalee (27) Today we are presenting our science project about parachute There’s a lot of ways to test a parachute And our group choose the number of strings method to test the parachute

How it works We are testing three parachutes with different number of strings And each parachute will test three times to make sure of the results

Results factor 1st time 2nd time 3rd time 4 strings 6 strings 3.86 seconds 4.00 seconds 4.47 seconds 6 strings 4.43 seconds 4.53 seconds 4.77 seconds 8 strings 4.66 seconds 7.64 seconds 5.66 seconds

The average time of flight 4 strings : 9.35 seconds 6 strings : 10.55 seconds 8 strings : 14.16 seconds

Discussion We also had an error And our error was that there was two persons for recording the time of falling parachute But we have an improvement Our solution can be that only one person can record the time for parachute

Conclusion It seems that a parachute with less strings fall more faster , and a parachute with more strings falls slower