"The clock stopped."

Translation: Klockan stannade.

[TimmieNimrod]

"Klockan slutade"? What's the difference between "sluta" and "stanna"?

[kate_irl]

I had the same question, but then I thought more on it - I could be wrong, but I think maybe 'sluta' would mean it is either over (has ended), or is out (like you ran out of something). So 'stanna' is used because the clock isn't gone, but has just stopped working.

[Ginkkou]

Indeed, slutade would be "The clock ended".
Stanna is specifically to stop moving, or stop something you control
To force something to stop, you'd use stoppa.

[dlista]

"klockan stoppade" - is this ok, too?

[Lundgren8]

No, you can only stoppa another person/thing. As in polisen stoppade honom på gatan.

[RossGee1]

Is a clock not a thing? You can stop it by removing its power source or pulling the set stem.

[Lundgren8]

Then you would use the verb stanna.

[Yerrick]

So stanna is reflexive and stoppa is transitive?

[craigchardy]

The opposite of transitive is intransitive. A reflexive uses a reflexive pronoun.

[Will709432]

So if you wanted to say the clock stopped functioning, would you use slutat or stannade?
Klockan har slutat/stannade fungerar?

[BarakSaltz]

As to "Klockan stannade.", there might be a cognate, albeit ambiguously, in the German translation:

Die Uhr ist stehengeblieben.