当一个物体只处于“上-下”方向排成直线时,被称为竖直。概略地称为与地平线或水平线垂直。
我们可以看到像是饭店房间里的大床——铺着米黄色的被子,床头板上竖直靠着许多枕头。
We could see what looked like a big bed in a hotel room—with beige quilts and pillows propped upright on the headboard.
那么什么叫简单的竖直区域?
即竖直方向的单位向量。
Then you guys know, you just told me, acceleration is -9.8, We call it "minus" because it's accelerating down and up was taken to be the positive direction.
然后你们都知道,你告诉我,加速度是-9.8,我们取负号是因为加速度方向朝下,而正方向为竖直向上
Path number 1 I'm going straight up in the V-T diagram.
路径1在T-V图上,竖直向上。
The velocity has no vertical component. There is no Vy.
初速度没有竖直分量,没有 Vy
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