If you were in a smooth-riding train with no windows, could you sense the difference between uniform motion and rest? Between accelerated motion and rest? Explain how you could make such a distinction with a bowl filled with water.
Answer : Theoretically, In niform motion acceleration is zero. At rest: The object is not moving therefore in this case also acceleration is zero. We can explain the concept with the help of bowl of water: These forces are actually just inertia. 1) Speed up: water in bowl moves back because of inertia. 2) Slow down: water moves forward 3) Turn left: water moves right 4) Turn right: water moves left