What makes mechanical equipment dangerous? It is because of the Mechanical Movement and Forces. Static Force If a support is not strong enough for an object with increasing weights, it might collapse suddenly. Dynamic Force The magnitude of some dynamic forces are constant but most of them change due to acceleration and deceleration. You should not enter the area covered by the mechanical movement of the equipment. Pressure If the safety valve for a pressure vessel e.g. the storage tank of an air compressor, is not working, the pressure will build up to a point it suddenly cause the tank to explode.