Speed
* Definition: Speed is a measure of how fast an object is moving. It tells you the distance traveled over a certain time.
* Formula: Speed = Distance / Time
* Units: Common units for speed are meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).
* Example: A car traveling 60 kilometers in one hour has a speed of 60 km/h.
Velocity
* Definition: Velocity is a measure of both how fast an object is moving *and* in what direction. It's a vector quantity, meaning it has both magnitude (speed) and direction.
* Formula: Velocity = Displacement / Time
* Units: The same as speed (m/s, km/h, mph).
* Example: A car traveling 60 km/h *east* has a velocity of 60 km/h east.
Key Differences
* Direction: Speed doesn't care about direction. Velocity does.
* Displacement vs. Distance:
* Distance is the total length of the path traveled.
* Displacement is the straight-line distance between the starting point and the ending point.
How to Find Speed and Velocity
1. Measure distance: Determine the distance traveled or the displacement of the object.
2. Measure time: Record the time it takes for the object to travel that distance or displacement.
3. Calculate speed: Divide the distance by the time.
4. Determine direction (for velocity): Specify the direction of motion (e.g., north, south, east, west, or relative to a fixed point).
Example:
Imagine a runner completing a lap around a 400-meter track in 60 seconds.
* Speed: 400 meters / 60 seconds = 6.67 m/s
* Velocity: The runner ends up at the same starting point, so the displacement is zero. Therefore, the velocity is 0 m/s.
Let me know if you have any more questions!
