Question

What are the two forces that keep a pendulum swinging?

Answer 1

the force of gravity is the only force that keeps a pendulum in motion. both the force increases the speed of the pendulum on the downswing and decreases it's speed on its upswing.

Answer 2

Tension force and the gravitational force

Step-by-step explanation:

A simple pendulum consists of small metallic bob suspended with a string. It is fixed at one end and the bob is swinging. There are toe forces acting on the bob. One is the tension force away from the bob and the weight of the bob acting vertically downwards. The component of the weight acts as the restoring force.