An impediment is anything that slows or blocks progress. It can refer to a physical thing, like a fallen tree in the road, or something more intangible, like how piracy is an impediment to the pleasure cruise industry in Somalia. See the pedi in there?
An oblique fracture is when the break has a curved or sloped pattern. A comminuted fracture is when the bone breaks into several pieces. A buckled fracture, also known as an impacted fracture, is one whose ends are driven into each other. This is commonly seen in arm fractures in children.
The concrete slump test is an empirical test that measures the workability of fresh concrete. More specifically, it measures the consistency of the concrete in that specific batch. This test is performed to check the consistency of freshly made concrete. Consistency is a term very closely related to workability. collapse slump is an indication of too wet a mix. Only a true slump is of any use in the test. A collapse slump will generally mean that the mix is too wet or that it is a high workability mix, for which slump test is not appropriate.