{ "cells": [ { "cell_type": "code", "execution_count": 1, "metadata": {}, "outputs": [], "source": [ "import sympy as sm\n", "import sympy.physics.mechanics as me\n", "me.init_vprinting()" ] }, { "cell_type": "code", "execution_count": 2, "metadata": {}, "outputs": [], "source": [ "m1, m2, m3, m4 = sm.symbols('m1, m2, m3, m4')\n", "N = me.ReferenceFrame('N')" ] }, { "cell_type": "code", "execution_count": 3, "metadata": {}, "outputs": [], "source": [ "r1 = 3*N.x + 4*N.y\n", "r2 = 3*N.y + 4*N.z\n", "r3 = 4*N.x + 4*N.z\n", "r4 = 3*N.y + 4*N.z" ] }, { "cell_type": "code", "execution_count": 4, "metadata": {}, "outputs": [], "source": [ "first_moment = m1*r1 + m2*r2 + m3*r3 + m4*r4" ] }, { "cell_type": "code", "execution_count": 5, "metadata": {}, "outputs": [], "source": [ "zeroth_moment = m1 + m2 + m3 + m4" ] } ], "metadata": { "kernelspec": { "display_name": "MinerU", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.10.16" } }, "nbformat": 4, "nbformat_minor": 2 }