For railway Bridges, the load effect of irregularity lane and wheel weight imbalances is a moving harmonic force.

对于铁路桥梁，机车通过时，车道不平顺及驱动轮重量的不平衡产生的荷载效应是一种移动的简谐力。

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now I'm really fantastic at drawing this mechanical device, but you can imagine that dropping a weight can cause a paddle wheel to turn.

机械装置的时候,我真的很着迷，你可以想象,当重物掉落的时候会带动桨轮旋转。

麻省理工公开课 - 热力学与动力学课程节选

Now you could do a similar sort of thing, but instead of having a candle, you have a paddle wheel, and the paddle wheel is spun by a weight that's dropping from here to here.

那接下来可以做一件类似的事，但不再是蜡烛，我们将它换成一个桨轮，桨轮末端拴一个重物,它可以从这掉落到这。

麻省理工公开课 - 热力学与动力学课程节选

Yet, I immediately noticed the hefty weight of the steering wheel.

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Increasing the weight placed over the front wheel also decreases stability, which is why it will wobble if you slam on the brakes (your body's momentum continues forward, shifting weight on to the handlebars).

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Considering this is essentially a front-wheel-drive car, with most of the weight on the front wheels, the TL has superb cornering balance, particularly as you lay on more throttle.

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