Physics By Sashi Kant (SmartiesGeeks)

Motion in Physics Velocity part2 continues.. When is velocity said to have change Velocity is a vector quantity. So, velocity has a magnitude as well as a direction. The magnitude of velocity is equal to the speed of the body. If either of the two, i.e., either speed or direction changes, velocity is said to have changed. Thus, the velocity of a body change due to a change in its speed, its direction, or both .     Let us consider a car travelling (towards east) at a constant speed of 10 m/s. Then, it has a constant velocity in that direction. When the takes a turn, its velocity changes although its speed remains constant. When the car is at right angles to its original direction, the its velocity (towards east) becomes zero, the speed remaining constant. When the car is travelling in the direction just opposite to the original direction, it has a negative velocity. So, the velocity of a moving object changes due to a change in its direction. What is meant by...

                                            To know the position of a moving body at any particular point of time, we should know the following parameters: 1.The distance travelled by the body up to that moment of time 2. the direction in which the body is moving. The distance travelled by a body can be obtained from its speed and the time interval. The speed of the body however does not tell us anything about its direction. The quantity which gives both the distance travelled and the direction of motion is velocity.  How is the term velocity defined Velocity is defined as follows:       The displacement of a body per unit time over a short interval is called velocity. Thus,                             Velocity, v  = Displacement(x)/ Time(t)   ...

How does instantaneous speed differ from average speed Although the terms instantaneous speed and average speed have similar definitions, but the two differ in the following respect Differences between instantaneous speed and average speed Instantaneous speed                                                                                          1 Instantaneous speed is the distance travelled by a body per unit time at a particular point of time (or in an infinitestimally small interval of time) 2 Instantaneous speed of a moving objec...