For example, suppose you use vertical motion and you use y instead of x; and a would be g or -g; that's a particle falling down under the affect of gravity.

例如,假设在竖直运动中,你用 y 来代替 x,那么 a 就是 g 或者 -g,这就是一个受重力作用下落的质点

耶鲁公开课 - 基础物理课程节选

The motion is just along the x axis.

只有 x 轴方向的运动

耶鲁公开课 - 基础物理课程节选

This spring is getting squashed on either side, and it'll squash by certain amount x, that depends on your mass, and that x will be turned into a motion of a needle and that'll read your mass.

这个弹簧两边都会受到压缩,压缩量为 x,它由你的质量决定,x 会转换成指针的运动,你从而可以读数

耶鲁公开课 - 基础物理课程节选

The J1 offers a few unique slow motion modes as well, though, including a bizarrely wide 8:3 (think 16:6, not 16:9) slow motion mode that snaps up to five seconds of 640 x 240-pixel video at 400 fps, played back at 29.97 fps.

ENGADGET: Nikon 1 J1 review (video) Hands-on

Xsens has supplied 3D body motion tracking technology for Hollywood productions such as Ted, John Carter, X-Men, The Avengers and many more.

ENGADGET: Xsens teases wearable 3D body sensors that won't cost, will track an arm and a leg (video)

Representatives from ESPN tell us that a native 720p 60 3D signal performs better during fast motion, which is something we'll see during the Derby and Summer X-Games.

ENGADGET: ESPN 3D officially launches with FIFA World Cup coverage: live from Bristol