Which phrase describes a scientific law?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

Amaterial that provides resistance to the flow of electric current is called a(an) (1 points)