$(i)$ Name the property by virtue of which a body resists a change in its state of motion. Name the physical quantity which is a measure of this property.
$(ii)$ Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

(N/A) $(i)$ The property by virtue of which a body resists a change in its state of motion is called inertia. Mass is the measure of inertia.
$(ii)$ This phenomenon occurs due to the inertia of rest. Initially,the leaves are in a state of rest. When the tree branch is shaken vigorously,the branch comes into a state of motion,but the leaves tend to maintain their state of rest due to inertia. Consequently,they resist the change,get detached,and fall down due to gravity.