Ethan pushes a wooden box across a carpeted floor. then he pushes the same box across a smooth marble floor. why does ethan find it easier to push the box on the marble floor than on the carpeted floor?

The smooth marble floor has lower friction coefficient

Explanation:

Remember that when you are pushing any object theres a force pulling on the opposite direction to you, that is the friction force, which is given by the next formula:

SInce he is pushing the same exact box, with the same exact weight, the only reason to find it easier is that the marble floor has a lower coefficietn friction, and for that reason he has less friction force working against him.