他自称发现了物体沿斜面运动的规律。
He claimed to have discovered the law of motion of an object on an inclined plane.
因此若这里改成小于号，物体就会沿斜面向下加速了。
So if I make this "smaller than" sign the object will start accelerating downhill.
问题来了，系统会沿斜面向上加速还是,向下加速，还是保持静止？
The question is now, is it going to be accelerated uphill or accelerated downhill or no acceleration at all?
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