Hi, Is it possible to help to accelerate an object with an Archimede Spiral ? We can apply a force F perpendiculary to the spiral, like this if we want to turn the spiral in its center we don't need energy. If we want to accelerate an object near the spiral, we apply a force F to the spiral, the spiral apply the same force in the contrary direction. The object accelerate. The spiral can turn without energy if the force F is perpendiculary to the surface (it's possible with an Archimede Spiral). Like the object accelerate, if we want always a contact between the spiral and the object, we need to accelerate the spiral, but this don't require more energy. In this case what is the energy need for accelerate the object ? It is the same without spiral ? Why ?