Factors Affecting Friction

Ram pushes the box by applying a force of $500 \mathrm{N}$ in horizontal direction so that the box starts sliding along the floor as shown in the figure. Find the point where the frictional force acting on the box is maximum.

Observe the given activity. What do you conclude from this?

Complete the passage using the suitable words given in the option below.

A rough surface will offer a (i)_____ frictional force than a smooth surface. The heavier the object, the (ii)_____ will be the frictional force. Friction is a (iii)_____ force.

Two objects $\mathrm{A}$ and $\mathrm{B}$ are moving on a rough surface as shown in the figure. The object $A$ has greater velocity than $\mathrm{B}$ then _____.