Answer:
If both the weight and the surface area double, the friction will also increase. Friction is directly proportional to both weight and surface area.
When weight increases, there is a greater force pressing the objects together, resulting in stronger intermolecular forces of friction between the surfaces. This leads to an increase in the frictional force.
Similarly, when the surface area in contact between two objects increases, there is a larger area for the intermolecular forces to act upon. As a result, the frictional force also increases.
Therefore, with a doubling of weight and surface area, the frictional force will also double. This is because friction depends on the normal force (which is directly related to weight) and the coefficient of friction (which remains constant in this scenario).