Final answer:
The force acting on the particle at point a can be determined by summing up all the forces acting on it.
Step-by-step explanation:
The force acting on the particle at point a can be determined by summing up all the forces acting on the particle at that point. Assuming we have the values for all the forces, we can simply add them up to find the total force.
F_total = F₁ + F₂ + F₃ + ...
By substituting the given values of the forces in the equation, we can calculate the force acting on the particle at point a.