掉落 (Drop) refers to the action of something falling from a higher position to a lower one due to gravity. This can occur with various objects, such as a ball, leaf, or even water droplets. The process of dropping can be influenced by factors like height, weight, and the surface it lands on. In physics, the concept of a drop is often studied in relation to motion and force. When an object drops, it accelerates towards the ground until it reaches its terminal velocity, where the force of gravity is balanced by air resistance. This phenomenon is essential in understanding basic principles of gravity and kinematics.