PHYSmidterm

PHYSmidterm - PHYS105 MIDTERM REVIEW ENERGY Energy=...

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PHYS105 MIDTERM REVIEW ENERGY Energy= capacity to do work o Cannot be created nor destroyed; can only transfer o Units = Wh…. Wh/1,000= 1 kWh o Usage: 1. Liquid fuel (gasoline) 2. Heating o Overtime energy needs have increased: hunting and gathering food - electricity Work= force x distance o Lifting an object (PE), applying force to a car (KE) o Units= joule o Conservative force Power= Work/time o Energy per unit time o Units= joules/second= watt Friction= stopping an object from moving o Non conservative force: KE/Work against friction thermal energy Newton’s Laws o 1. Object in motion stays in motion unless acted upon by an outside force o 2. Force= mass x acceleration POPULATION 6 billion people on earth doubling time= 70/ growth rate (%) Malthus- population will grow faster than food supply Fertility rates are decreasing, life expectancy increasing Hardin- Tragedy of the Commons o Shared resources will be destroyed if we don’t act mindfully
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PHYSmidterm - PHYS105 MIDTERM REVIEW ENERGY Energy=...

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