* Velocity is a vector quantity: This means velocity has both magnitude (speed) and direction.
* Changing direction means changing velocity: Even if the object's speed remains constant, a change in direction alters the velocity vector.
Think of it like this:
* Constant speed, changing direction: Imagine driving a car at a steady 50 mph around a corner. Your speed stays the same, but the direction of your motion is changing, so your velocity is changing.
* Constant direction, changing speed: If you step on the gas in your car and accelerate, your speed changes, but your direction stays the same (assuming you drive straight). This is also a change in velocity.
In summary: Velocity is affected by both speed and direction. Any change in either one will result in a change in velocity.
