Relative Velocity - Overview, Structure, Properties & Uses

Relative Velocity - Definition, Formula, FAQs

Edited By Team Careers360 | Updated on Jun 09, 2022 01:39 PM IST

What is relative velocity class 11 and What do you mean by relative velocity?

Relative velocity definition: Objects have reference frames that show how they move in relation to another object. When the relative motion of an item, such as a train, is calculated, the relative motion can be expressed in terms of the earth's relative motion. So, in this case, a train is moving at a certain speed relative to the earth (which is the reference frame of the given example).

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In the context of relative motion, reference frames are critical because relative motion is calculated with regard to them. We can use the motion of the earth around the sun as an example of a larger reference frame, with the solar system serving as the reference frame for the earth's motion around the sun.

Relative Velocity

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What is relative velocity? Or explain relative velocity or define relative velocity or definition of relative velocity -

We come into situations when one or more objects move in a non-stationary frame in relation to another observer. A boat, for example, may traverse a river that is flowing at a certain velocity, or an airplane may encounter wind while flying. In all of these cases, we must consider the effect that the medium has on the item in order to characterize the object's whole motion. We calculate the relative velocity in two dimensions of the object while doing so, taking into account the particle's velocity as well as the velocity of the medium. We will learn how to calculate relative velocity in this section.

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Relative acceleration-

The comparison of the acceleration of two separate objects or rigid things travelling in the same or opposite directions is known as relative acceleration. Acceleration is defined as the rate of change of resultant velocity over a certain time interval. The relative acceleration can be calculated using the following general formulae:

aA = aB + aA B

The above general form of the relative acceleration gives the acceleration of point A which is equal to the acceleration of point B with the acceleration of point A with respect to the acceleration of point B.

With the help of the above information of relative velocity and relative acceleration, we can easily calculate the value of relative motion.

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NCERT Physics Notes:

Frequently Asked Question (FAQs)

1. Name the factors that influence the piston's velocity in a reciprocating pump mechanism.

The length of the connecting rod is determined by the angular velocity of the crank, the radius of the crank, and the angular velocity of the crank.

2. A motorcycle travelling at 120 kilometers per hour on the highway passes a car travelling at 90 kilometers per hour. What is the motorcycle's speed as seen from the perspective of a car passenger?

Let us denote the motorcycle's velocity as VA and the car's velocity as VB.

VAB = VA – VB

We get VAB = 120 km/h – 90 km/h = 30 km/h by substituting the variables in the above equation.

As a result, the motorcycle's relative velocity to the car's passenger is 30 km/h.

3. Determine whether the following statement is true or false: Negative relative velocity is possible.

The above statement is correct. Negative relative velocity is possible. It is possible for relative velocity to be negative because it is the difference between two velocities regardless of their magnitude.

4. What is the difference between relative velocity and velocity?

The difference between velocity and relative velocity is that relative velocity is measured in relation to a reference point that is located at a different location. While absolute velocity is measured in a frame where an object is either at rest or moving with regard to the absolute frame, relative velocity is measured in a frame where an object is either at rest or moving with respect to the absolute frame.

5. Why is it necessary to use relative velocity?

The usage of relative velocity is necessary since it is needed to determine whether an object is at rest or moving.