Is a force needed to keep a spacecraft moving?

Answer 1

On Earth, there is friction and air to slow vehicles down. There isn't any in space therefore they do not slow you down. As for gravity, it is much less in space. The amount of gravity depends on how close/far you are from a planet as to what the speed does, whether increase or decrease. This decrease in gravity allows a vehicle to move more freely,with the absence of friction and air to slow the vehicle. Thus space movement can be defined as how close the vehicle is to a planet, which will in turn affect the amount of gravity and either slow down or speed up the vehicle. The closer it is to a planet, the more gravity and the faster it will go. The further away it is, the less gravity and the slower it will move. But above all else, it could move indefinitely with the absence of air and friction to slow it down.

Answer 2

Yes, because the first law of motion explains the state of motion of an object does not change until a force acts on it , that means a thing that will go into a straight line until another thing changes it motion. And Also there usa force needed to overcome inertia when rocket takes off.

Answer 3

A force is needed to keep a spacecraft moving in a straight line at a constant speed due to Newton's first law of motion. This force is typically provided by the initial rocket propulsion that puts the spacecraft into motion and any subsequent adjustments made by onboard thrusters during the journey to counteract external forces like gravity or atmospheric drag.