为什么陀螺仪能用来给飞机和手机做方向导航？
Why can a gyroscope be used to guide the orientation of aircraft and phones?
高速旋转的陀螺具有定向性，其自转轴在空间中的方向很难被外力改变（角动量守恒）。测量轴方向的微小偏移就能推算出载体的姿态变化，从而导航。
A fast-spinning gyroscope holds its orientation because its spin axis resists being turned, by conservation of angular momentum. Sensing tiny deviations of that axis reveals the vehicle's attitude change, enabling navigation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#角动量 #定向 #惯性物理
为什么锤头松了，把锤柄朝下往地上磕几下就能紧？
Why does striking a loose hammer handle downward on the ground tighten the head?
柄突然被地面挡住停下，而锤头因惯性继续向下运动，套紧在柄上。反复几次利用惯性把锤头夯到位，松动就被消除了。
The handle stops abruptly when it hits the ground while the head, by inertia, keeps moving downward and wedges onto the handle. Repeating it uses inertia to drive the head home and remove the slack.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#惯性 #冲击 #惯性物理
为什么用力抖动被子能把上面的灰尘抖掉？
Why does vigorously shaking a quilt knock the dust off it?
抖动时被子被快速甩动改变运动方向，而灰尘由于惯性想保持原来的静止或运动状态，于是与被子分离脱落。惯性让灰尘留在原地而被子先走。
When you shake the quilt it is jerked into rapid motion changes, while the dust, by inertia, tends to keep its original state and separates from the fabric. Inertia leaves the dust behind as the quilt moves on.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#惯性 #分离 #惯性物理
为什么坐车急转弯时身体会向外侧歪？
Why does your body lean outward when a car turns sharply?
转弯时车改变方向，而你的身体因惯性仍想沿原直线前进，于是相对车厢向转弯的外侧偏移。这就是离心现象，本质是物体保持直线运动趋势的惯性。
During a turn the car changes direction while your body, by inertia, wants to keep going straight, so relative to the car you shift toward the outside of the turn. This centrifugal tendency is really inertia resisting the change in motion.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#惯性 #离心 #惯性物理
为什么公交车急刹车时，站着的乘客会向前冲？
Why do standing passengers lurch forward when a bus brakes suddenly?
这是惯性：乘客和车一起向前运动，车突然减速时身体下半身被车厢带动减速，而上半身仍要保持原速度向前，于是向前倾倒。安全带就是用来对抗这种惯性。
This is inertia. The passenger moves forward with the bus; when the bus brakes, the lower body is slowed by the floor while the upper body tends to keep its original speed, so it pitches forward. Seat belts counteract this inertia.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#惯性 #牛顿第一定律 #惯性物理