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# Introduction

A brief description of the example.
```*CONSTRAINED_JOINT_PLANAR
Sliding Blocks with Planar Joint
LS-DYNA Manual Section: *CONSTRAINED_JOINT_PLANAR

*INITIAL_VELOCITY_NODE
*CONSTRAINED_EXTRA_NODES_SET

Example: Sliding Blocks with Planar Joint

Description:
This problem illustrates a planar joint connecting two rigid bodies.

Model:
The first block measuring 2*2*2 slides along a second block measuring
2 * 2 * 8.
A third flexible body controls the time step size. The first block has a
ramped pressure of 100 psi applied to the top surface and ramped concentrated
forces applied to a lower edge of 40 lbs. The initial velocity of the first
block is 400 inches/second.

Input:
One joint definition consist of nodes 128, 126, 129 and 127
(*CONSTRAINED_JOINT_PLANAR). The nodes are extra nodes attached to the rigid
bodies and are coincident (*CONSTRAINED_EXTRA_NODES_SET, *SET_NODE_LIST).

Results:
The plots show that the first block correctly slides across the second block.```