2 sentences for 惯性 (guàn​xìng)

1. 汽车紧急刹车时，乘客由于惯性会向前倾。

   qì​chē jǐn​jí shā​chē shí, chéng​kè yóu​yú guàn​xìng huì xiàng qián​qīng.

   When the car brakes suddenly, passengers lean forward due to inertia.

   Source: Dong Chinese Dictionary

2. 他已经退休了，但由于职业惯性，每天还是早早起床。

   tā yǐ​jīng tuì​xiū le, dàn yóu​yú zhí​yè guàn​xìng, měi tiān hái​shi zǎo​zǎo qǐ​chuáng.

   He has retired, but due to professional habit, he still gets up early every day.

   Source: Dong Chinese Dictionary