Step-by-step explanation:
The normal force exerted on the crate is equal in magnitude but opposite in direction to the weight of the crate.
The normal force is the force exerted by a surface perpendicular to the surface itself. In the case of a crate on a horizontal frictionless surface, the normal force is the force exerted by the surface upward, perpendicular to the surface.
In the absence of any vertical acceleration or vertical movement, the normal force is equal in magnitude but opposite in direction to the weight of the crate. This is because the normal force must balance out the force of gravity acting on the crate, ensuring that the net force in the vertical direction is zero.
So, the normal force exerted on the crate is equal to the weight of the crate, Fn.