Question

why does a pendulum keep swinging ?​

Answer 1

here the answer

the pendulum keeps swinging because of friction

Hope it helps u

Answer 2

The earth's gravity attracts the pendulum. When the pendulum is hanging still,the wire and weight are straight and at a 90 degree angle to the earth as gravity pulls the string and the weight towards the earth. Inertia causes the pendulum to stay at rest until a force causes it to move. When the wire and weight are moved in straight motion, the wire and weight are acting under inertia. This keeps the pendulum in motion.

I hope this helps..