Can a pendulum swing forever in space?

No. Pendulums don't work in space, but even in a vacuum here on earth they would still stop. A pendulum requires a pivot where the pendulum bob connects to its supporting object, like a beam. Any pivot will cause some friction which will eventually stop the pendulum, even if it takes much longer than without a vacuum.

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And another question, how long will a pendulum swing for?

Would a pendulum go forever in a vacuum? If you manage to eliminate all these effects then yes, the pendulum will oscillate forever.

Can you say yes or no?

And another question, what is the yes or no game? The Yes Or No game rules are nice and simple. You ask a young person a long series of questions that would normally require that they answer "Yes" or "No"; however, the young person isn't allowed to say either of these words. They're also not allowed to nod or shake their head.

How do you win yes-no game?

If the opponent says "Yes" or "No" or repeats the same answer twice, the player rings the bell and keeps the card. If the opponent answers all the questions without tripping up, they keep the card. The player with the most cards at the end is the winner. What is importance of pendulum clock? A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is a harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.