You must work out some way to have a net external force exerted on your ship.
-- If you're close enough to the sun or another star, then you can put up a big sail,
and take advantage of all the electromagnetic radiation or stellar wind it catches.
-- Otherwise, you must eject mass in the direction opposite from the way you want
to accelerate. You can do that by burning rocket fuel and ejecting the hot gases, by
electrically accelerating ions and letting them shoot out the back, by firing bullets
out the back, by spitting, etc.
Yes, that is why they are used in space.
Spacecraft make use of jet propulsion.
Rockets are not unable to accelerate in space; in fact, they can accelerate quite effectively. In the vacuum of space, rockets rely on Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When a rocket expels propellant backward, it generates thrust that propels the rocket forward, allowing it to accelerate even in the absence of air or other mediums. Thus, the lack of atmosphere does not hinder a rocket's ability to accelerate; it can continue to gain speed as long as it has fuel to burn.
much less air resistance.
Energy enough to accelerate the object to an orbital velocity.
Yes, rockets can accelerate in space. When the exhaust accelerates away in one direction, the rocket accelerates away in the other, as any reaction is balanced by an equal and opposite reaction.
The answer is a space-shuttle. So cool, right!
Yes, an object can accelerate without friction. The only thing that is needed to accelerate an object is net force acting on it should not be zero. Then the accleration of body is given by Newton's 2nd Law: F = m*a . For example Rockets in space experience no friction, but they accelerate due to force on them by the exhaust gases.
By reducing its velocity and dropping to a lower orbit. Objects in low orbit travel around the earth faster due to the orbit's smaller circumference. Conversely, it slows down by increasing its velocity and ascending to a higher orbit with a greater circumference.
Weightlessness
... to accelerate.... to accelerate.... to accelerate.... to accelerate.
... then it won't accelerate.... then it won't accelerate.... then it won't accelerate.... then it won't accelerate.