To get into orbit you need 2 pushes. One push upwards puts you at altitude, the other is sideways to make you fall around the Earth and not come back down. If

To get into orbit you need 2 pushes. One push upwards puts you at altitude, the other is sideways to make you fall around the Earth and not come back down. If you have one big push, you escape the Earth's gravitational pull. If your push isn't big enough, you fall back to the ground.