Wednesday, March 23, 2016

A comparison of PhET and OSP gravity lab

 A comparison of PheT and OSP gravity lab

Thanks PhET!

Thanks to PhET refreshed version, it gave me the chance and reason to revisit my own basic gravity lab to refresh and do a check on the calculation.
PhET just refreshed their gravity lab simulation with a same radius for different mass feature.

OSP@SG has already implemented this feature as a norm at the design stage as I only want students to notice the forces of gravity independent of size of radius of masses. Thanks to PhET design, i refreshed my gravity lab to be more optimised for the small student personal devices, Android is of course fully supported in full screen mode. check it out here.

 i used the code  forceValue[0]=" |F₁|="+(elecForce[i]*0.00000000001).toFixed(12)+" N "; to create the same look as PhET. thanks PhET for the design idea! http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/08-gravity/266-gravity01-0

orientation and fullscreen

 7.1 Gravity Force Model (Basic) JavaScript in Fullscreen mode Portrait Orientation on my Samsung Note 3
 7.1 Gravity Force Model (Basic) JavaScript in  Portrait Orientation on my Samsung Note 3
 7.1 Gravity Force Model (Basic) JavaScript in  Landscape Orientation on my Samsung Note 3
 7.1 Gravity Force Model (Basic) JavaScript in Fullscreen mode Landscape Orientation on my Samsung Note 3

small calculation difference

I quickly check if the calculations are correct as both simulations gives the same result! The slight difference from PheT's version could be due to truncation.

See the images of the case M1=50 kg, M2=200 kg and r= 4 m.
assuming G = 6.67408 x 10-11

F1 = F2 = Gm1m2/r^2 = 4.171255x10-8 N

Which simulation do you prefer?

Enjoy playing with both simulations!

some of my earlier pictures

 http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/08-gravity/266-gravity01-0

 http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/08-gravity/266-gravity01-0

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