In the above video we show a
wooden block
resting at a roughened flat surface.
The inclination of the surface can be varied.
Below a critical inclination
the static friction keeps
the wooden block in its place.
But, the static friction which is needed to keep the wooden block
at rest, is larger at larger angles.
Above the critical inclination
the static friction which is needed for equilibrium is larger
than the maximum static friction.
Hence, the block slides down suffering
dynamic friction.
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