Physics, how to get magnitude of a vector, e.g. change in momentum - IEB, ISC, NSC, Cambridge AS/A

In this video we discuss how to get the magnitude of a vector such as change in momentum/impulse mathematically, and not just visually by picking the number (size) and omitting the negative sign because direction is not needed when magnitude is asked. A ball is dropped from rest from a certain height and it bounces upon impact with the floor. The contact time on the floor is worked out as t2 - t1, Newton's 2nd law in terms of momentum is applied to determine the magnitude of the net force acting on the ball. The mathematical approach is very useful when students are dealing with multiple choice questions. It involves multiplying the vector by -1 to get the magnitude only.

[John-qrs]

As usual very informative. Maths made easy!!! Thank you sir

[ramasmazodze]

Please note this is not the usual method of using components and Pythagoras as this is about extracting the magnitude (positive solution) when dealing especially with variables and not actual numbers