* Speed is how fast something is moving. It tells you the rate of change of position over time.
* Acceleration is how fast something's speed is changing. It tells you the rate of change of velocity over time.
To find acceleration, you need more than just speed:
1. You need the change in speed. This means you need to know both the initial speed and the final speed.
2. You need the time it takes for the speed to change.
The Formula:
Acceleration (a) = (Final Speed (vf) - Initial Speed (vi)) / Time (t)
Example:
* A car starts from rest (vi = 0 m/s) and reaches a speed of 20 m/s in 5 seconds (t = 5 s).
* Acceleration (a) = (20 m/s - 0 m/s) / 5 s = 4 m/s²
Key Points:
* Positive acceleration means the object is speeding up.
* Negative acceleration means the object is slowing down (also called deceleration).
* Constant acceleration means the speed changes at a steady rate.
Let me know if you'd like more examples or have other physics questions!
