Are vacuums frictionless?

No, the Space is not Frictionless.

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Consequently, are pendulums used today?

Pendulums are used in many engineered objects, such as clocks, metronomes, amusement park rides and earthquake seismometers. In addition, engineers know that understanding the physics of how pendulums behave is an important step towards understanding motion, gravity, inertia and centripetal force. Also, what happens if you swing the pendulum gently or swing it more forcefully? Answer: When the swing is raised and released, it will move freely back and forth due to the force of gravity on it.

People also ask what causes a pendulum to swing?

Function. The science behind the pendulum is explained through the forces of gravity and inertia. The Earth's gravity attracts the pendulum. This swinging-back-and-forth force continues until the force that started the movement is not stronger than gravity, and then the pendulum is at rest again. Would a pendulum swing in space? No, it wouldn't swing back and forth. Pendulums on Earth require gravity to pull the swing back down after they swing upwards. Since there is no gravity in orbit, there is no force that pulls the pendulum down and make it swing back and forth.

Thereof, how does a pendulum not stop?

If there were no friction or drag (air resistance), a pendulum would keep on moving forever. In reality, each swing sees friction and drag steal a bit more energy from the pendulum and it gradually comes to a halt. But even as it slows down, it keeps time.