Different objects travel the same distance but take different amounts of time because some objects are traveling faster or slower than others
Speed
How far an object moves in a given time interval, indicates how fast an object is moving without referring to the direction of motion, a scalarquantity
A fast moving object has a high speed and covers a relatively large distance in a short amount of time, in contrast to a slow moving object that has a low speed and covers a relatively small amount of distance in the same amount of time
An object with no movement at all has a zero speed
Speed formula
Speed = Distance / Time
The SI unit for speed is meter per second, other units include kilometers per hour and miles per hour
Calculating Ian's average speed
Speed = Distance / Time
Speed = 120 meter / 30 seconds
Speed = 4 meters per second
Instantaneous speed
The speed of an object at a particular instant
If an object's instantaneous speed values are always the same, it means the object is moving with constant speed (constant motion)
Speedometer
A device used to measure the instantaneous speed of a vehicle
Velocity
Speed with direction, a vectorquantity, refers to the rate of change in displacement
Velocity formula
Velocity = Displacement / Time
Instantaneous velocity
The velocity of an object at a particular instant
If the velocity is the same throughout, it is called constant velocity
Average speed
It represents the speed of the object throughout it's travel
Instantaneous speed
It refers to speed of the object at a particular instant
