1) What are the qualities or characteristics/moments required for a silent movie/documentary? Is there any difference between a movie without sound and a documentary?

2) How does the emotions being portrayed in a silent movie affect you oppose to a movie with sound?

3). In a regular movie with sound expressing your emotions seems to be very easy for the actors/actresses and effective with the audience. If no sound is added in a movie how hard would it be for the actor/actresses to depict that emotion and have the audience share their affect to it?