When your mom is making lunch, the forces acting on your mom are gravity and normal force.
Step-by-step explanation:
Gravity is the force exerted by earth on objects.The force of gravity is equal to the weight of the object. Movements or immobile positions on earth, all involves gravity and it is the gravitational force that enables you to stand still.Gravity is exerted in the downward direction.
Normal force acts on the upward direction opposite to the direction of gravity.When your mom is making lunch,gravity acts on her in the downward direction while an equal normal force acts in the upward direction.The gravity and normal force are balanced forces here.