Speed and Velocity
definition
Uniform Speed
For a body covering equal distances in equal time intervals, the speed is called uniform speed
definition
Average speed
It is a scalar quantity. Its unit is m/s.
definition
Velocity
It is a vector quantity and has units m/s.
The direction of a velocity vector is same as the direction of the motion of body at that instant of time. Magnitude of instantaneous velocity is same as the speed at the instant.
definition
Uniform motion
Note:
If a body is in uniform motion, then the net external force on the body is zero. Inverse of the statement is also true (If the net external force on the body is zero, then the body is in uniform motion).
definition
Speed
S.I unit of speed is
definition
Uniform, variable and average speed
Variable Speed: A body is said to be moving with variable speed if it covers unequal distances in equal intervals of time.
Average Speed: Average speed of a body is defined as that uniform speed with which it covers the same distance in a given interval of time as is actually covered by it in the same interval of time while moving with variable speed.
It is given by the ratio of the total distance travelled by the body to the total time taken by it.
Average speed
