Question

（1）研究“共點(diǎn)力的合成”時(shí)得到的實(shí)驗(yàn)結(jié)果為如圖所示（F′與A、O共線，A端為固定橡皮條的圖釘，O為橡皮條與細(xì)線的結(jié)點(diǎn)），需要進(jìn)行比較的是                                                                      和                          ；（填“F₁”、“F₂”、“F”或“F′”）通過本實(shí)驗(yàn)可以驗(yàn)證                                                                                   ．

（2）在上述實(shí)驗(yàn)中所說的合力與兩個(gè)分力具有相同的效果，是指下列說法中的           ．                              

A、彈簧秤的彈簧被拉長(zhǎng)                                                                B、固定橡皮條的圖釘受拉力產(chǎn)生形變                                                                                                                                     

C、細(xì)線套受拉力產(chǎn)生形變                                                             D、使橡皮條在某一方向上伸長(zhǎng)到某一長(zhǎng)度．                                                                                                                                       

                                                                                                               

Answer 1

F′，F(xiàn)；力的平行四邊形定則．D