[jeffreyH]

Things follow straight line trajectories unless acted on by a force. The force produces an acceleration. If you plot a constant acceleration you get a straight line graph. This is equivalent to a uniform gravitational field. If you plot jerk, the change in acceleration over time, you get a curve. This is equivalent to a real gravitational field. To understand curved spacetime you need to understand the mathematics. No pop science analogy will help you understand.