When a person is walking, there are typically four main forces acting on their body:
1. Force of weight on the body: This force is the downward force exerted by the Earth's gravity on the person's body. It acts vertically downwards towards the center of the Earth.
2. Normal force by the ground on the body: This force is exerted by the ground or floor on the person's body and acts perpendicular to the surface. It counteracts the force of weight and prevents the person from sinking into the ground.
3. Static friction force by the ground on the body: This force is present when the person is walking on a surface that provides enough friction to prevent slipping. It acts parallel to the surface and opposes the motion or tendency to slide.
4. Direction man is walking: This arrow indicates the direction in which the person is walking. It does not represent a force but rather the motion of the person.