Scenario:
* Initial velocity (vᵢ): The velocity the object starts with.
* Final velocity (vƒ): The velocity the object ends with.
* vƒ < vᵢ: This means the final velocity is smaller than the initial velocity.
What this tells us:
This scenario indicates that the object has decelerated. Deceleration is simply a negative acceleration, meaning the object's velocity is decreasing over time.
Causes of deceleration:
* Friction: Forces like friction (air resistance, ground friction) oppose the motion of an object, causing it to slow down.
* Gravity (in certain cases): If an object is thrown upwards, gravity acts against its initial upward velocity, causing it to decelerate until it momentarily stops and falls back down.
* Braking: Cars and other vehicles use brakes to create a force that opposes their motion, causing them to slow down.
Important note:
While "deceleration" often implies slowing down, technically, it's any change in velocity in the opposite direction of the object's motion. So, even if an object is initially moving in a negative direction and then speeds up in that same direction, it's still considered deceleration.
Let me know if you have any other questions or want to explore specific examples!
