Question

why an object go up or forward in space even it has no force

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Answer 1

A force is a pushing or pulling action that can make things move, change direction, or change shape. When a force acts on an object, it often makes it move faster or in a different direction. Once something is moving, you don't need a force to keep it moving: it will carry on moving all by itself unless another force stops it. When a rocket blasts into space, you need a force to make it lift off to begin with and to overcome the force of Earth's gravity. But once the rocket is in space, it will carry on moving all by itself until and unless another force stops it.