A short-cut is to think about a couple who are in love or quarrel. When in love, both are walking together in one direction holding hand (i.e. current in both wires are in same direction ). Hence there is ATTRACTION between them. When the couple quarrel, both are walking in opposite direction (i.e. c urrent in opposite direction ). Hence there is REPULSION between them.

The distance-time (displacement-time) graph on the left is not related to the speed-time (velocity-time) graph. Both are of difference scenarios. But both shows the motion of 2 objects and both graph has an interception point. Do the interceptions point mean the same time in each graph? The image below shows the basic interpretation of the respective graphs. To have examples of the graphs with values and the step-by-step how to find the time it overtakes, refer to the videos below. Finding the exact time where the overtaking takes place.

01 The various physical quantities in kinematic Video tutorial 02: Acceleration Video tutorial 03: Graphical Analysis of Motion (Displacement (distance)-Time Graph and Velocity (speed)-Time Graph) Video tutorial 04: Describing the motion of the car – practice Video tutorial

A man is standing on a uniform plank of mass 20 kg and 6 m long. He is standing 1 m from the string at A. a) Find the unknown forces FA and FB. ( Ans: Fa = 550 N and FB = 250 N) The man now walks to the left of A. b) Determine the maximum distance in which the man can move before the plank topples. (Ans: d = 0.67 m)