* Newton's Laws of Motion: The fundamental laws of physics, particularly Newton's First Law of Motion (inertia), dictate that objects at rest tend to stay at rest, and objects in motion tend to stay in motion at a constant velocity unless acted upon by an external force. This means an object needs a force to change its speed.
* Acceleration: Speeding up or slowing down requires a change in velocity, which is called acceleration. Acceleration takes time. To go from zero speed to a certain speed, the object needs to accelerate over a period of time.
Example:
* Bicycle: To get a bicycle moving, you need to apply force through pedaling. The faster you pedal, the faster the bicycle accelerates. However, even if you pedal very hard, the bicycle will still take a tiny amount of time to reach a noticeable speed.
* Ball: To make a ball go fast, you need to throw or kick it. The force of your throw or kick accelerates the ball. Again, this acceleration takes a small amount of time.
Instantaneous Changes in Speed are Theoretical:
In theoretical physics, we can talk about "instantaneous velocity" at a specific point in time. However, this is a mathematical concept, not a real-world phenomenon. In reality, even if you apply a very large force, there will always be a tiny amount of time needed for an object to change its speed.
