Abraham and Sir Isaac

If Abraham really wrote the Egyptian papyri that Joseph Smith translated into The Book of Abraham, how the hell did Newtonian ideas end up in there? Were Abraham and Sir Isaac on the same wavelength? Did Joseph maybe sneak a little something into his translation that wasn't exactly in the words of Abraham but more in his thoughts? Or was it all made up post-Newton and have absolutely nothing to do with Abraham at all?

Whatever the case, whoever let Isaac into The Book of Abraham should have passed him up for a German fellow named Albert.