Gravity Exercise

[Scott Ferguson]

Changes log:

2015/09/08 - bug fix -- ball could stick to canvas bottom; new version is 2

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END of changes log

Fling anywhere on the the Canvas to see the gravity demonstration.

Try adjusting the gravity, bounciness and rolliness values to simulate different materials and bodies (earth - 1.5 vs the moon - 0.25)

How it works: 

A Clock Timer is used to update the position of a ball by applying x and y velocities and gravity.

When the ball bounces a bounciness multiplier reduces it's y velocity until it eventually stops bouncing.

When the ball rolls, a rolliness multiplier reduces it's x velocity until it eventually stops rolling.

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sf

[Abraham Getzler]

Nice demo, but my ball mostly just lays there.

I may need to consult with my personal physicist.

ABG

On Mon, Sep 7, 2015 at 10:03 PM, Scott Ferguson <scottfr...@gmail.com> wrote:

Fling the Canvas to see the gravity demonstration.

Try adjusting the gravity, bounciness and rolliness values to simulate different materials and bodies (earth - 1.5 vs the moon - 0.25)

How it works: 

A Clock Timer is used to update the position of a ball by applying x and y velocities and gravity.

When the ball bounces a bounciness multiplier reduces it's y velocity until it eventually stops bouncing.

When the ball rolls, a rolliness multiplier reduces it's x velocity until it eventually stops rolling.

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sf

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[Scott Ferguson]

:-)

Are you flinging the canvas (not the ball itself) in a upward direction?

If the ball doesn't move much, you can reduce gravity and/or increase the FlingVelocityAdjustment value to be more responsive.

If the ball sticks to the bottom of the canvas rather than bounce sometimes that (hopefully) has been corrected with a bug fix in updated version 2 which is attached here and in the Gallery.

Thanks for trying it out!

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sf

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[Benni Keller]

Nice Job. I hope you can help me, despite publication 2015.

I need a option for bouncing from other balls. Like this:

I would like to make it so that the ball falls and if it hits an obstacle it should bounce off and in the end this ball falls into a container at the bottom.

There it should then be checked in which container it fell and how many points this gives.

Thanks.

[Taifun]

you already asked your question in the Kodular community here https://community.kodular.io/t/image-sprite-falling/50152/4?u=taifun

please respect the rules of this forum...

You are welcome to leave replies for existing posts, but you may not create a new post asking for support.
Why? Because this group is an *ARCHIVE*, not a support forum.
Since the way permissions are setup with Google groups, in order to allow replies to existing posts, I must allow new posts.
And I do want feedback!
So please honor my wishes on this.

Taifun

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Trying to push the limits of App Inventor! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.        

[Michael Ferguson]

Hi, Taifun!

Perhaps turn off the ability for users to post to avoid frustration, if that is possible?

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Scott Ferguson

[Taifun]

I not changed the following settings

and

All the best!

Taifun

PS: See you probably one day in the community here https://community.appinventor.mit.edu/