Suspense is a feeling of uncertainty and anxiety about the outcome of certain actions, most often referring to an audience's perceptions in a dramatic work. Suspense is not exclusive to fiction, though. Suspense may operate in any situation where there is a lead up to a big event or dramatic moment, with tension being a primary emotion felt as part of the situation. In the kind of suspense described by film director Alfred Hitchcock, an audience experiences suspense when they expect something bad to happen and have (or believe they have) a superior perspective on events in the drama's hierarchy of knowledge, yet they are powerless to intervene to prevent it from happening.
How does Jaws create Suspense?
The false sense of secruity in Jaws creates suspense, the build up to the shark attack is enhanced by tensional music and the noises of children playing. The camera shots change from above water to underwater which create in our minds the POV from a shark, working with the music this creates a sense of suspense. The fake shark attack is a anti climax to the dramatic buld up, and this then makes the real shark attack even more unexpected. Jaws uses clever camera shots along with tensional music and loads of people in the sea to create and build suspense.