Core Knowledge
A. MOTION
•Velocity and speed
The velocity of an object is the rate of change of its position in a particular direction. Speed is the magnitude of velocity expressed in distance covered per unit of time. Changes in velocity can involve changes in speed or direction or both.
• Average speed = total distance traveled divided by the total time elapsed Formula: Speed = Distance/Time (S = D/T)
Familiar units for measuring speed: miles or kilometers per hour