Q: Is propulsion any mechanism for propelling solid bodies along the ground? ¶
A: Yes, and usually for the purposes of transportation.
Q: Is propulsion any method used to accelerate spacecraft and artificial satellites? ¶
A: Yes.
Q: Is propulsion the mechanism or system used to generate thrust to move a ship or boat across water? ¶
A: Yes.
Q: Is propulsion an active area of research? ¶
A: Yes.