Answer:
1 weight, 2) normal and 3) friction
Explanation:
In a circular path on the block various forces are exerted, at the lowest point of the path we have the following forces
1) The weight that is the attraction of the Earth on the body, is directed vertically, downwards
2) The normal that is the reaction of the Earth to the support of the body, is directed vertically upwards
3) if the track has a friction force in the opposite direction of the turn, directed horizontally and in the opposite direction of the direction of movement.