Chapter 4 - Force and Motion - Learning Path Questions and Exercises - Conceptual Questions - Page 132: 4

a) The bubble will move in the opposite direction. If the force is removed, the bubble will return to its original position. b) We can see whether the body is accelerating or decelerating and at what rate by using an accelerometer.

a) Because the level is accelerating and there is no direct contact with the bubble, it will be left behind, causing it to look as if it is going in the opposite direction relative to the accelerometer. b) We can see whether the body is accelerating or decelerating and at what rate by using an accelerometer.