EOSC 114 Lecture Notes - Winter 2018 Lecture 3 - Radioactive decay, Kinetic energy, Yield (engineering)
20 Sep 2018
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Motion and change: energy causes things to move or change, many disasters release immense amounts of energy, thus causing catastrophic changes, energy is related to force, work, power, pressure, stress, etc. The si unit of force is the newton (n): gravity is a for(cid:272)e that attra(cid:272)ts (cid:373)atter to ea(cid:272)h other. O(cid:271)je(cid:272)ts of (cid:373)ass (cid:373) (cid:374)ear the earth"s surface are pulled towards the earth with a force equivalent to: We usually care about change of sensible heat, which is related to change in temperature by: latent heat is stored (hidden) when matter changes phase from solid to liquid, or from liquid to vapor. Power: power is the rate of doing work, or of consuming energy. Pressure (p) and stress: pressure (p) is force per unit surface area, applied perpendicular to the surface, stress is force per unit surface area, applied parallel to the surface. Stress causes strain: stress tends to strain objects. As the amount of stress increases, strain increases.
