What is the reason why the finger lamp on the monitor doesn't work? Does anyone know?

Both the small card and the clip are initially at rest. When the small card is suddenly popped up with your fingers, the small card flies forward due to the elasticity, while the clip keeps the original static state due to inertia, so the clip falls into the cup under the action of gravity. Examples of applying inertia in life are: long jump run-up, and the thrown ball continues to fly forward. So, the answer is: inertia; Long jump run-up, the thrown ball continues to fly forward, etc.