十万个为什么·科学启蒙30篇（4）

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为什么赤道上物体重量略轻

Earth rotates fastest at the equator, creating a stronger outward centrifugal force there.
This force slightly opposes gravity, making objects feel lighter than at the poles.
The equatorial bulge also means you’re farther from Earth’s center, weakening gravitational pull.
Gravity at the equator is about 0.5% weaker than at the poles due to both effects combined.
A 100-kg person weighs roughly 0.5 kg less at sea level on the equator than at the North Pole.
Scientists measure these tiny differences using ultra-precise gravimeters aboard ships and satellites.
Weight changes don’t affect mass, which stays constant regardless of location.
Pendulum clocks run slightly slower near the equator because gravity is weaker there.
GPS systems must account for Earth’s shape and rotation to calculate accurate positions.
These variations help geophysicists map Earth’s internal density and tectonic movements.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Weight changes don’t affect mass, which stays constant regardless of location. 体重变化不影响质量，质量在任何地点都保持不变。
These variations help geophysicists map Earth’s internal density and tectonic movements. 这些重力变化有助于地球物理学家绘制地球内部密度分布及构造运动图。
Scientists measure these tiny differences using ultra-precise gravimeters aboard ships and satellites. 科学家借助船载和卫星搭载的超精密重力仪测量这些微小差异。

这篇中文题目最接近哪一句？为什么赤道上物体重量略轻一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？地球在赤道处自转最快，由此产生的离心力也最强。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Objects Weigh Slightly Less at the Equator How to cook noodles A maths worksheet

Weight changes don’t affect mass, which stays constant regardless of location.

Weight changes don’t affect mass, which stays constant regardless of location.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Weight changes don’t affect mass, which stays constant regardless of location.