講波台何輝
2021-12-17 18:50:18
三條newton law of motion
1st law: 如果冇net 嘅external force act on 一件物件
呢件物件一係靜止不動 一係就均速 (constant velocity) 向一個方向移動
2nd law: force = the rate of change of momentum
簡單啲就係F=ma (只要個mass唔變)
3rd law: action force and reaction force pair