ERTH 2415 Lecture Notes - Lecture 1: Natural Disaster, Friction, Planetary Differentiation
10 Oct 2016
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Document Summary
Gravity: forces of attraction between masses m1 and m2 separated by distance r. Driving force is the component of gravity parallel to the slope. Resisting force is proportional to inertia and friction, and counteracts the driving force: if you"re unsure inertia means the resistance of any physical object to any change in its state of motion. Adding mass high on a slope: 2. Removing support at the base of the slope. Removal of lateral support decreases stability: in case you"re unsure lateral support is to help prevent sideways movement. Presence of weak material: material that deforms plastically under stress and looses strength, crumbly, poorly-consolidated material lubricants: ex. clay. In case you"re unsure plastic deformation is the change in shape of a solid body without fracture under the action of a sustained force. Fractures in rock: fractures oriented in the slope direction are unstable, fractures in rock exist at different scales.
