Velocity
* Definition: Velocity describes both the speed and direction of an object's motion. It's a vector quantity.
* Units: Meters per second (m/s) or kilometers per hour (km/h), etc.
* Example: A car traveling at 60 km/h eastward has a velocity of 60 km/h eastward.
* Key Points:
* Velocity changes if either speed or direction changes.
* A constant velocity means moving at a steady speed in a straight line.
Acceleration
* Definition: Acceleration is the rate at which an object's velocity changes over time. It's also a vector quantity.
* Units: Meters per second squared (m/s²)
* Example: A car speeding up from 0 to 60 km/h in 10 seconds is accelerating.
* Key Points:
* Acceleration can be positive (speeding up), negative (slowing down), or zero (constant velocity).
* Even if an object is moving at a constant speed, it can still be accelerating if its direction changes (like a car turning a corner).
Relationship between Velocity and Acceleration
* Acceleration causes changes in velocity. Think of it this way:
* Applying the brakes results in *negative acceleration* (slowing down).
* Stepping on the gas pedal results in *positive acceleration* (speeding up).
* Turning the steering wheel causes acceleration because the direction of motion is changing.
In Summary
* Velocity tells you how fast and in what direction something is moving.
* Acceleration tells you how quickly the velocity is changing.
