Space-Time Continuum: This is a four-dimensional structure (three dimensions of space and one dimension of time) in which events occur. In our trampoline analogy, this would be the fabric itself.
Gravity: A force that attracts two bodies toward each other. In our analogy, this is represented by how smaller balls roll towards larger ones on our bent trampoline surface.
Mass-Energy Equivalence: This principle from Einstein’s theory suggests that mass and energy are interchangeable under certain conditions (E=mc^2). It's like saying if we could somehow convert our bowling ball into pure energy, it would create an enormous amount of power.