Forces, vectors and free body diagrams

Easy

A worker pushes a heavy wooden crate across a flat floor with a horizontal pushing force, $F$ , as shown in the diagram.

A crate on a flat floor with forces F, X, and Y

Which of these gives the correct names for forces $X\,$ and $Y$ ?

force $X$ : upthrust, force $Y$ : friction

force $X$ : friction, force $Y$ : reaction

force $X$ : reaction, force $Y$ : friction

force $X$ : reaction, force $Y$ : weight

Forces, vectors and free body diagrams Questions