Give the magnitude and direction of the net force acting on a stone of

1.	Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg just after it is dropped from the window of a train accelerating with 1 ms-2.
Answer» In the train, accelerating with 1 ms^-2, the stone experiences on additional force F (also horizontal) given by: F' = Ma = 0.1 x 1 = 0.1 N As the stone is dropped, the force F' no longer acts and the net force acting on the stone is, F' = Mg = 0.98 N (vertically downwards)

Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg just after it is dropped from the window of a train accelerating with 1 ms-2.

Answer»

In the train, accelerating with 1 ms^-2, the stone experiences on additional force F (also horizontal) given by:

F' = Ma = 0.1 x 1 = 0.1 N

As the stone is dropped, the force F' no longer acts and the net force acting on the stone is,

F' = Mg = 0.98 N (vertically downwards)