Difference between Instantaneous velocity and Instantaneous speed
Instantaneous velocity
- The velocity of object at the given instant of time is known as instantaneous velocity.
- It is defined as the limiting value of average velocity in very small interval of time (△t)
- The time interval is very small such that it tends to zero, but not zero exactly.
- Hence the instantaneous velocity is given as,
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5) SI unit of instantaneous velocity is meter/second
6) Magnitude of average velocity is same as that of magnitude of instantaneous velocity for uniform motion.
7) Magnitude of average velocity is not same as that of magnitude of instantaneous velocity for non-uniform motion.
Instantaneous velocity
- The speed of object at the given instant of time is known as instantaneous speed.
- It is defined as the limiting value of average speed in very small interval of time (△t)
- The time interval is very small such that it tends to zero, but not zero exactly.
- During short interval of time (△t), the path length is same as the magnitude of displacement; hence the magnitude of instantaneous velocity is equal to magnitude of instantaneous speed.
- Hence the instantaneous speed also can be given as,
6) SI unit of instantaneous speed is meter/second
7) Magnitude of average speed is same as that of magnitude of instantaneous speed for uniform motion.
8) Magnitude of average speed is not same as that of magnitude of instantaneous speed for non-uniform motion.