Speed is how fast an object is moving. Speed is the distance covered over a time period.
Speed Formula: Speed = Distance/Time.
Example:
A man driving a car, covered 20 meters in 10 minutes. What is his average speed?
Speed = Distance/Time.
Speed = 20m/10 minutes.
Speed = 20m/ 600 seconds.
Speed = 0.03 m/s.
Velocity is speed with direction. Velocity is vector quantity and speed is scaler. We calculate velocity with displacement (vector) and not distance (scaler).
Velocity Formula: Velocity = Displacement/Time.
Example:
A man was riding a bike from the grocery to home. He rode 30 meters west in 10 minutes. What is his average velocity?
Velocity = Displacement/Time.
Velocity = 30 meters/10minutes.
Velocity = 30 meters/600 seconds.
Velocity = 0.05 m/s west.
When an object velocity is changing, it is accelerating. Acceleration is the change of velocity. When velocity increases or decreases, it is accelerating. When velocity changed its object direction, it is accelerating.
Acceleration Formula: Acceleration: Change in Velocity/Change in Time.
Acceleration: (Final Velocity — Initial Velocity) / (Final Time — Initial Time).
Example:
A man was driving a boat north. In point A, his velocity was 12 m/s. When he reached point B, his velocity was 15m/s. And it took him 10 seconds to reach point B. What was his acceleration?
Acceleration: Change in Velocity/Change in Time.
Acceleration: (15m/s — 12m/s) / (10s — 0s).
Acceleration: 2m/s / 10s.
Acceleration: 0.2 m/s².
