use of physics force , fails in touch devices!!

i want to achieve following functionality in my game but its not working when installed in android phone.

how to make this work in touch devices.???

please download capx from here highcube.net/knownsensesite/ksredesigned/new/new.zip

please let me know how to make this work in touch devices..

the code is fine but i don't know why its not working in the phoone??

ASAP

thanks in advance :)