Question

as the marble moves around the jar, how many forces are acting on it?

Answer 1

1.centripital force

2.mg(downwards)

3.normal

i don't think that there would be more forces acting on it

Answer 2

The forces which acts on the marble which is moving around the jar are Kinetic force, centripetal force and centrifugal force with force of gravitation.

Explanation:

The marble when moves around the jar has to move in a complete circular motion which is only possible by the force acting on the marble as the centripetal force and the centrifugal force, which substantiate the rotational motion possible.

Rest the kinetic force is due to the motion and the gravitational force due to the Earth.