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inclined planes.

or here is another version of such

http://www.geogebra.org/en/upload/files/nikenuke/incline01.html

be sure to measure

A suitable applet on the mass on wedge, really good

http://surendranath.tripod.com/Applets/Dynamics/BlockPlane/BlockPlaneApplet.html

For stuff with no acceleration ?!?

Constant Velocity!

The Inclined plane

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