Reply To: Where is Har Sinai??

The Jews willingly forced themselves under the mountain as Rashi explains on והם תכו לרגלך. The mountain was lifted from the kedusha. If the Jews would not have accepted the Torah, the kedusha would have left and they would have been crushed underneath it. This is similar as the Yerushalmi says that Moshe Rabbenu was able to carry the luchas because the letters on it made it light, but by the golden calf the letters flew off and the luchas became heavy and he could not carry it anymore and had to drop it.