The discussion revolves around the concepts of speed, velocity, and acceleration in physics, particularly focusing on the distinction between constant speed and constant velocity. The original poster expresses a lack of understanding regarding why only constant speed can accelerate and not constant velocity.
Some participants have provided explanations regarding the differences between scalar and vector quantities, and how these relate to acceleration. The original poster and others are engaging with these concepts, indicating a productive exchange of ideas, though some confusion remains.
The original poster is new to physics and is seeking clarification on fundamental concepts, which may influence the depth of discussion and understanding.
Niriz said:Since speed it a scalar quantity it only refers to how fast an object is moving. Velocity is a vector, meaning that its speed AND direction are important. Acceleration is also a vector quantity, so if an object's movement either changes direction, or goes faster, there is aceleration.
If an object is moving at constant speed, it could change directions which is a form of acceleration, but it would still be going at the same speed.
However, if an object is to be moving with constant velocity, it's speed and direction cannot change for it to be constant. It cannot accelerate
fizzynoob said:a scalar does not have a direction, it is just some quantity, for example temperature is a scalar since it does not have a direction. Speed is also a scalar