Question

name the missing force... weight force normal force tension force frictional force

Explanation:

The diagram shows a horizontal force \( F_B \) acting on a student (presumably on a surface, like a chair or seat). The missing force should balance \( F_B \) horizontally. Frictional force opposes relative motion or impending motion between surfaces in contact. If \( F_B \) is a horizontal force (e.g., from pushing), the frictional force would act opposite to it to balance (if in equilibrium) or oppose motion. Weight is vertical (gravity), normal is vertical (support), tension is from ropes/cables. So the missing horizontal force opposing \( F_B \) is frictional force.

Answer:

frictional force