How do we write free body diagram for an object that is rebounding?

Here's an illustrated example

enter image description here

Let us assume that the object has an initial force.

So, I want to draw free body diagram for each condition in order to see in how many seconds it took KLM. I'm also assuming that the object hits the point M.

EDIT: My main goal is to obtain time duration between KLM

  • $\begingroup$ A free body diagram is drawn for a specific moment in time. You can draw one for the situation at K, one at L and one at M. This cannot be used to find the falling duration, though, so I'm not entirely sure of what you are asking. $\endgroup$
    – Steeven
    Dec 12, 2018 at 6:59
  • $\begingroup$ @Steeven I was going to draw free body diagram to know falling duration. If drawing free body diagram will not help, what should we use? $\endgroup$
    – Hamilton
    Dec 12, 2018 at 7:03
  • $\begingroup$ It will help but it will not be enough. You need more information to solve this, such as the duration that the initial force is exerted. $\endgroup$
    – Steeven
    Dec 12, 2018 at 7:29

1 Answer 1


imagine slope as horizontal surface

we can imagine slope as horizontal surface so we consider that velocity make angle theta with horizontal surface and acceleration due to gravity become a=-gcos theta .here, - signs shows downward direction. now, you can calculate time as normal projectile motion problem!!!


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