小华利用杠杆、弹簧测力计、细线和若干个质量相同的钩码等实验器材探究“杠杆的平衡条件”。

                                                                                                                                                                                                          

次数	动力F/N	动力臂L/cm	阻力F/N	阻力臂L/cm
1	1	10	2	5
2	2	10	1	20
3	2	15	3	10