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	<title>Real-Time Physics Simulation Forum</title>
	
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	<updated>2013-10-20T07:12:17+00:00</updated>

	<author><name><![CDATA[Real-Time Physics Simulation Forum]]></name></author>
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		<entry>
		<author><name><![CDATA[kangaroo]]></name></author>
		<updated>2013-10-20T07:12:17+00:00</updated>

		<published>2013-10-20T07:12:17+00:00</published>
		<id>https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=31971#p31971</id>
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		<title type="html"><![CDATA[planar constraint]]></title>

		
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Hi. Though it is not directly related to bullet, can somebody help me out a little bit. Lets take take a particle bouncing off a plane. From an impulse based point of view, constraint equation would look something like this (Vn+ + e*Vn-)/(1+e)=0, where e - coefficient of restitution, Vn+ - normal component of post-impact velocities, Vn- - pre-impact. Can this expression be written from a force-based point of view?<p>Statistics: Posted by <a href="https://pybullet.org/Bullet/phpBB3/memberlist.php?mode=viewprofile&amp;u=10081">kangaroo</a> — Sun Oct 20, 2013 7:12 am</p><hr />
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