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We have in LO.3 Mechanics G10
First: the Concepts
Second: the References
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Third: the Videos links
Fourth: Skills
Fifth: the materials as PPT., DOCX., and PDF
In the Drive from this link
Few Notes:
Relative Velocity
When we are travelling in a car or bus then we can see the trees and buildings outside, going backward. But are they really going backward? No, as we know that it is our vehicle that is moving while the trees are stationary on the ground. So, then why do the trees appear to be moving backward? On the other hand, the co-passengers with us who are moving, but appear stationary to us despite moving. This concept is explained in physics with the help of relative velocity. In this topic, we will see the relative velocity formula withy examples. Let us learn it!
Relative Velocity Formula
What is relative velocity?
Since we and our co-passengers are moving together. Therefore, there is no relative velocity between us and the passengers. Also, the trees are stationary while we moving. Thus, the trees are moving at some relative velocity with respect to us and the other passengers. Here, the relative velocity is the difference of velocities between you and the tree.
Relative velocity is generally used to describe the motion of airplanes in the wind or moving boats through water etc. This velocity is computed according to the person as an observer inside the object. This can be determined by introducing an intermediate frame of reference.
Let us consider two objects A and B which are moving relative to each other. Then the relative velocity will be the velocity in which a body A would appear to body B and vice versa. Mathematically, we nay say that the relative velocity will be the vector difference between the velocities of two objects.
The relative velocity of A with respect to B= velocity of the body A – velocity of the body B.
Mathematically,
V_{AB} = V_{A}– V_{B}
Where:
V_{AB} relative velocity of the body A respect body B
V_{A} velocity of the body A
V_{B} velocity of body B
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