Movement is ultimately caused by which physical concept?

• A. Distance
• B. Matter
• C. Force
• D. Time

Answer: (C)

Movement happens because of force. A force is a push or pull that changes an object's motion. If there’s no net force, an object at rest stays put and an object in motion keeps moving in a straight line at a constant speed. When a net force acts, it changes the velocity—this is acceleration—so the object speeds up, slows down, or changes direction. This is encapsulated in the idea that force causes motion changes, often written as F = ma. Distance and time describe how far and how long the motion occurs, but they don’t cause the motion itself. Matter is the stuff being moved, but it’s the applied force that makes it move.