Suppose that after the bomb explodes, fragments are scattered everywhere. Because of the conservation of explosive momentum, they all got the speed in a certain direction.

But after the explosion, they only receive gravity and slight resistance (if the explosion is only on the surface of the planet), and finally make parabolic motion to the ground.

In the rectangular coordinate system, the earth revolves around the sun in the universe, and it is subjected to the gravity of the sun and the very small gravity of other planets, making an approximate circular motion.

But they are similar in that they both accept external forces and do limited exercise.