Why is it more difficult to move and need more power / fuel, the more the spacecraft weighs?

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I know this may be a stupid question. but have never understood one thing. what i have heard and seen from tv and internet.

why is it harder to move around and turn with rcs and why is it needed stronger engines and rockets and more fuel the more the spacecraft weighs ??

as if we compare sputnik 1 and ISS. like sputnik 1 is much smaller than ISS therefore sputnik 1 has a much smaller weight than the ISS.
but if we say that sputnik had RCS and ISS also had RCS. then they should both move equally fast in space, they are weightless. Like I love space, they read a lot about them. but has never found out about it with weights and movements in space ...

But what I have seen, big spacecrafts need a lot more power and bigger engines / rockets to reach their goal. than a small spacecraft.

Please answer this, it would be fun to find out why not all things can move as fast with the same power of rcs in space.

What I learned in school and heard from all the people. They say the same thing. everything is weightless in space so everything is as flexible to move in space.

thanks!

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