Question

Three cases of relative motion

Answer 1

Answer:

Behind it, there lies a very important concept of relative motion, which will make us understand why objects appear to move differently with different frames.

What is Relative Motion? .

Relative Velocity.

Relative Motion in One Dimension.

Relative Motion in Two Dimensions.

Answer 2

Answer:

here it is.Hope it helps

Explanation:

The concept of reference frames was first introduced to discuss relative motion in one or more dimensions. When we say an object has a certain velocity, then this velocity is with respect to some frame that is known as the reference frame. In everyday life, when we measure the velocity of an object, the reference frame is taken to be the ground or the earth.

For example, if you are travelling in a train and the train is moving at a speed of 100 km/hr, then your speed according to another passenger sitting on that train is zero. According to him, you are not moving. But if someone observes you from outside the train, standing on the ground, according to him, you are moving with 100 km/hr as you are on the train and the train is moving with 100 km/hr.

Here, the motion observed by the observer depends on the location (frame) of the observer. This type of motion is called relative motion.

Relative Velocity

The relative velocity of an object A with respect to object B is the rate of change of position of the object A with respect to object B.

If VA and VB be the velocities of objects A and B with respect to the ground, then

The relative velocity of A with respect to B is VAB = VA – VB

The relative velocity of B with respect to A is VBA = VB – VA

Relative Motion in One Dimension

In one-dimensional motion, objects move in a straight line. So there are only two possible cases:

Objects are moving in the same direction

Objects are moving in the opposite direction

Again take the example of a man sitting on the train if the train is moving with 100 km/hr forward. Then according to the man sitting on the train, the trees outside are moving backwards with 100 km/hr.

Because from the man’s point of view, the outside environment is moving in the opposite direction to the train with the same velocity.

So for all types of questions, if you have to find the velocity of A with respect to B, then assume that B is at rest and give the velocity of B to A in the opposite direction.