A custodial pushes a crate across the gym floor. What are the forces used

when a custodian pushes a large crate across the gym floor, forces acting on the crate are the one applied by the custodian, frictional force acting in the opposite direction of motion acting between the surface of crate and floor and reaction force (normal force) acting in upward direction normal to the surface

Explanation:

this is poiselle's equation from fluid mechanic in physics. mech eng