Wind is an applied force because the wind is blowing on the leaves causing them to move.Friction is forming when the leaves are constantly brushing against the ground. The wind are blowing the leaves all over the place and when they hit an object gravity brings them down toward the ground.
When wind blows leaves into branches high up into the branches inertia is being applied because the leaf is stuck and can no longer go anywhere until the wind blows on it again making it fall onto the ground. When the leaves get stuck in the branches they are sitting on top of a stable object which is the branch is called a normal force. The harder the wind blows the farther and faster it will go.
The bigger the leaves the more they will weigh and will not go as far when the wind is applied onto it. The leaf is brushing against the ground and the ground is brushing against the leaf. Even when the leaf gets ripped into smaller pieces of it it will still involve all of Newtons Laws.