【李永乐老师】两辆车60km/h对撞，和一辆车120km/h撞墙，效果一样吗？
Li Yongle uses momentum and Newton's second law to answer a viewer's question. He shows why impact force grows with the square of speed, and why two equal cars colliding at 60 km/h are like one car hitting a wall at 60, not at 120. He then explains why a plane hitting a bird is a different case.
B216:26李永乐老师For Chinese speakersChinese captions by the creator
Formulas are written on screen; the captions leave out the letters.
Key words
| Chinese | English |
|---|---|
| 撞击力 (zhuàngjīlì) | impact force |
| 动量 (dòngliàng) | momentum |
| 质量 (zhìliàng) | mass |
| 速度 (sùdù) | speed |
| 动能 (dòngnéng) | kinetic energy |
| 牛顿 (Niúdùn) | Newton |
| 平均 (píngjūn) | average |
| 平方 (píngfāng) | square (of a number) |
| 相对 (xiāngduì) | relative |
| 实验 (shíyàn) | experiment |
Did you understand?
如果车速翻倍，撞击力大约会变成原来的几倍？
两辆质量相同的车以60千米每小时对撞，相当于什么？
讲质量差别很大的情况时，他用了什么例子？
Why it's B2
- 263 characters a minute (fast, native speed)
- 73% of the characters are in common words (the course's words up to B1, about HSK 1–4)
- Made for Chinese speakers
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