# Collision/Gravity Problem
**URL:** https://discussions.unity.com/t/collision-gravity-problem/672829
**Category:** Physics
**Tags:** Physics
**Created:** [August 1, 2017, 1:00pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829 "2017-08-01T13:00:42Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@AlmostDeadYT](https://discussions.unity.com/u/AlmostDeadYT)
#### Post date: [August 1, 2017, 1:00pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/1 "2017-08-01T13:00:42Z")
Hello, my name is Alex.
I m trying to do some simple sh\*t but it doesn’t really work properly.
I m trying to stack squares one over another,but when i try to put them on the top of each other, they vibrate, the one that is under the one i m holding with mouse, it’s vibrating, and all the “building” is vibrating,as i approach the square i m holding in the air with my mouse.
ps: when i deactivate the rotation (the Z axis ),it’s not bugging anymore.
my skype: tzigared (add me, i m desperate)
my gmail: [almostdead911@gmail.com](mailto:almostdead911@gmail.com)
ps:in the image, it’s shown how i try to drag the square on the top of others, and the “building” vibrates and fall
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### Author:  [@AlmostDeadYT](https://discussions.unity.com/u/AlmostDeadYT)
#### Post date: [August 1, 2017, 1:05pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/2 "2017-08-01T13:05:43Z")
update: there is a video in which i show you what its not working,because i don’t really know how to explain better
: h t t tp s… [ufile.io/1d6lk](http://ufile.io/1d6lk)
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### Author:  [@BoogieD](https://discussions.unity.com/u/BoogieD)
#### Post date: [August 1, 2017, 2:49pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/3 "2017-08-01T14:49:47Z")
I suspect they are rigidBody cubes and their box colliders are causing a reaction to the cube you are controlling with the mouse.
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### Author:  [@AlmostDeadYT](https://discussions.unity.com/u/AlmostDeadYT)
#### Post date: [August 1, 2017, 4:35pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/4 "2017-08-01T16:35:29Z")
> [@BoogieD](#):
>
> I suspect they are rigidBody cubes and their box colliders are causing a reaction to the cube you are controlling with the mouse.
i think so, and i don’t know what to do to make it smooth and without that bug.
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### Author:  [@BoogieD](https://discussions.unity.com/u/BoogieD)
#### Post date: [August 1, 2017, 5:49pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/5 "2017-08-01T17:49:49Z")
Try making the mass of the block you are moving to a low amount and the stacked blocks mass much higher so they don’t react as much.
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### Author:  [@AlmostDeadYT](https://discussions.unity.com/u/AlmostDeadYT)
#### Post date: [August 2, 2017, 12:10pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/6 "2017-08-02T12:10:43Z")
> [@BoogieD](#):
>
> Try making the mass of the block you are moving to a low amount and the stacked blocks mass much higher so they don’t react as much.
i don’t want to do that,since i want all the squares to be the same,i mean i can put 3-4, or even 6-7,it’s not that the x square needs to be different, they all need to be the same
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### Author:  [@BoogieD](https://discussions.unity.com/u/BoogieD)
#### Post date: [August 2, 2017, 12:42pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/7 "2017-08-02T12:42:38Z")
Just make it the same mass once you have stacked it.
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### Author:  [@AlmostDeadYT](https://discussions.unity.com/u/AlmostDeadYT)
#### Post date: [August 2, 2017, 4:21pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/8 "2017-08-02T16:21:55Z")
> [@BoogieD](#):
>
> Just make it the same mass once you have stacked it.
they are all same mass from the beginning,and that’s how it shoud be
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### Author:  [@BoogieD](https://discussions.unity.com/u/BoogieD)
#### Post date: [August 2, 2017, 5:52pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/9 "2017-08-02T17:52:29Z")
So it should not work then.
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### Author:  [@AlmostDeadYT](https://discussions.unity.com/u/AlmostDeadYT)
#### Post date: [August 2, 2017, 5:58pm UTC](https://discussions.unity.com/t/collision-gravity-problem/672829/10 "2017-08-02T17:58:39Z")
> [@BoogieD](#):
>
> So it should not work then.
why shouldn’t it work? you told me to change only 1 square’s mass,but i want all of the squares to have the same mass…because it will be only 1 type of square,not 2:)