A student draws a free-body diagram for a box moving to the right on a horizontal floor and includes weight downward, normal upward, and a rightward applied force. The student also adds a rightward 'motion' arrow as a force. What is the flaw in the diagram?

A block has velocity function $\vec{v}\left(t\right)$ that increases with time along the $+\text{x}$ direction. What must be true about the net force on the block?

Which sequence best represents a sound strategy for finding the horizontal net force on a block when its velocity is given as a function of time?

An engineering intern claims that using mass in kilograms and acceleration in centimeters per second squared still gives force directly in newtons. Which judgment is correct?

Why is it valid to use only $\overrightarrow{F_x}=m\overrightarrow{a_x}$ when analyzing a block whose motion is purely horizontal on a flat surface?