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Chapter 13 Review
formulas + units for power and energy
Question | Answer |
---|---|
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 |