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What are the forces acting on a bouncing ball?

Asked by A Dinesh

Sir ,
I am using a basic overlap amount to find the force on the bouncing ball. And compute the position of the Ball. I have a following concept question.

When the ball is in the air the only force acting is gravity. So from gravitational force we can compute the acceleration and the position. Through the explicit euler integration I found the position of the ball until it interacts with the wall.

Once it interacts with the wall I found the overlap amount and from the material properties of both the spheres, I computed the force acted upon the bouncing ball by the sphere. So I will get a positive force upward and for the next time step that positive force addition to the gravity, will be considered to compute the position. Exactly after that one time step if we again compute, we get only gravitational force and the ball will com down.

But in general, the ball has to go up until its velocity has to become zero. And ther it has to repeat the same. So how can I model this using force, to compute the position of wall?

Thank you

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Jan Stránský (honzik) said : 		#1

Hello,

Exactly after that one time step if we again compute, we get only
> gravitational force

not necessarily, two particles may be in contact more than one time step

So how can I model this using force, to compute the position of wall?

Here I don't understand the question. Either the wall is fixed (you know
the position) or you do the same explicit time integration (computing
force, than acceleration and than new position) with the wall. So please
give us more details on your problem.

cheers
Jan

2016-06-18 12:27 GMT+02:00 A Dinesh <email address hidden>:

> New question #295435 on Yade:
> https://answers.launchpad.net/yade/+question/295435
>
> Sir ,
> I am using a basic overlap amount to find the force on the bouncing ball.
> And compute the position of the Ball. I have a following concept question.
>
> When the ball is in the air the only force acting is gravity. So from
> gravitational force we can compute the acceleration and the position.
> Through the explicit euler integration I found the position of the ball
> until it interacts with the wall.
>
> Once it interacts with the wall I found the overlap amount and from the
> material properties of both the spheres, I computed the force acted upon
> the bouncing ball by the sphere. So I will get a positive force upward and
> for the next time step that positive force addition to the gravity, will be
> considered to compute the position. Exactly after that one time step if we
> again compute, we get only gravitational force and the ball will com down.
>
> But in general, the ball has to go up until its velocity has to become
> zero. And ther it has to repeat the same. So how can I model this using
> force, to compute the position of wall?
>
>
> Thank you
>
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