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When you hear the term "constant velocity," think about movement that is steady and unchanging. An object moving with constant velocity maintains the same speed and direction. In the context of the elevator moving upward, this means that there are no accelerations impacting the system.
This uniformity is crucial because it ensures that any experiment or game, like darts, behaves as though it were at rest on solid ground. The dart, once thrown, moves within a frame of reference that doesn't change unexpectedly. There are no sudden speed-ups, slow-downs, or directional shifts, allowing you to aim and shoot just as you would on stable ground.
In all scenarios where constant velocity is present, it confirms that the situation is predictable and follows the same physical laws as a stationary system.

A "frame of reference" is essentially the viewpoint from which you observe and measure phenomena. Imagine standing still on the ground versus inside a smoothly ascending elevator. Even though the elevator is moving, if it travels at constant velocity, your immediate experience inside does not differ from standing still.
This concept allows us to understand why games or experiments conducted in an elevator moving at a constant speed adhere to the same rules as those on the solid ground. Both scenarios share an equivalent frame of reference because, internally, your surroundings seem unchanging.
Newton’s First Law applies here, ensuring whether you're in a moving elevator or stationary, the principles dictating object behavior remain unchanged.

Internal forces refer to those forces that act between the particles within a system. Think of them as the interplay of forces like tension or compression inherent within the system itself. In your game of darts, these are the forces exerted when you pull back the dart or when it flies through the air.
When in a constant velocity setting, like an upward-moving elevator, these internal forces don't change due to the overall motion of the elevator. Your throw's power and direction stay consistent because the system is isolated from external influences altering its intrinsic forces.
Comprehending internal forces helps grasp why the dart’s behavior isn't affected by the elevator’s movement itself.

External forces are those that act on a system from the outside, changing the system's overall motion. When you're inside an elevator moving with constant velocity, there don't appear to be any external forces acting on your immediate environment.
Newton's First Law reassures you that without any net external forces acting (like gravity already balanced by the elevator's movement), the internal state, including how darts fly, stays unaffected. This means your strategies for throwing the dart don't need adjustments because the elevator's consistent upward speed cancels any potential changes an external force could cause.
Understanding external forces reinforces why your game remains unchanged in differing controlled environments, like the steady elevator ride.