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Chapter 13 Review

formulas + units for power and energy

QuestionAnswer
PE + KE mechanical energy
Work divided by time power
Force times displacement work
1/2 mass times velocity squared kinetic energy
Force times displacement times cos(theta) work done at an angle
mass times gravity times height potential energy
SI unit for energy and work joule
SI unit for power watt
SI unit for force (weight) newton
work done if object not displaced zero
measure of work output to input efficiency
must be absent for mechanical energy to be conserved friction
will have the biggest effect on kinetic energy if both have same number velocity
2 or more simple machines compound
mass times acceleration force
Created by: cadetjt