An object at rest will stay at rest until an external force acts on it. What was the external force that acted on the night once the hoop was removed?

Explanation:

The first law states that a body at rest will stay at rest until a net external force acts upon it and that a body in motion will remain in motion at a constant velocity until acted on by a net external force.Friction is the force between an object in motion and the surface on which it moves. There was a net external force on the night because of change in momentum as the hoop was removed.

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible