With the added weight of people and supplies, it would simply take too long for the craft to reach acceleration speed.

如果装载人和货物，这样的重量很难使飞船达到加速速度。

youdao

And, in fact, there is a sideways acceleration at that point even though the speed is not changing.

事实上在那一点存在一个侧向的加速度，即使它的速率没改变。

youdao

OK, so, now that we know the position of the point as a function of time, we can try to study how it varies in particular things like the speed and acceleration.

好，既然我们已经知道点的位置，它是一个关于时间的函数，我们就能了解，它在诸如速率或加速度的量中是如何变化的。

youdao

And, you know acceleration means either change of speed or change of direction.

你知道加速度意味着,不是改变速度就是改变方向。

麻省理工公开课 - 固态化学导论课程节选

Whenever you see a particle moving in a circle, even if it's at a constant speed, it has an acceleration, v square over r directed towards the center.

只要看到质点做圆周运动,即使是匀速圆周运动,也存在一个加速度,大小为 v^2 / r,方向指向圆心

耶鲁公开课 - 基础物理课程节选

Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选

Caine and colleagues are currently pioneering new tracking devices for swimmers, which employ body-mounted gyroscopes and accelerometers in tandem with cameras and sensors around the pool to monitor body position, acceleration, speed and power.

CNN: High-tech kit speeds athletes into new era

Most drivers will not notice much performance advantage in the SL 550 from a Mercedes costing half the price, because most drivers never remotely approach the upper limits of acceleration, speed or traction that set it apart.

FORBES: Test Drive: 2013 Mercedes SL 550 Roadster

It will still have the improved acceleration and top speed of the bigger pack, so will be a better product than originally ordered, and can be upgraded to the range of the 60 kWh upon request by the original or a future owner.

ENGADGET: Tesla Model S axes 40 kWh battery option, surpasses sales goals