Question

plzz expalin why .....

Answer 1

This is related to the Newton law. the law states that an object continues to be at rest or motion until an external force acts on it.
the leaves of tree are in state of rest. when we shake the tree, the branches move, but the leaves Continue to be at the same position but unable to do so, they get detached.

another example of this law- If you dust a carpet, all the dust comes out. because the carpet moves, but the dust continues to be at rest and thus gets separated.