accelerometer
/əkˌsɛləˈrɑmətər/
noun
- A device that measures acceleration or the force of movement, often used in smartphones, fitness trackers, and vehicles.
- The smartphone uses an accelerometer to detect when you rotate the screen.
- Fitness watches contain an accelerometer to count your steps.
- The car's airbag system relies on an accelerometer to trigger deployment during a crash.