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| What two things make up the universe? |
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| What is the equation of work? |
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| Does the path traveled matter for work? |
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| What are the units of work? |
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| Measure of how fast work is done |
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| What is the equation for power? |
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| More power=____________________ |
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| What is the unit of power? |
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| How many watts are in one horsepower? |
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| What are the units for energy? |
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| There are ________ forms of energy. |
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| There are ________ forms of energy. |
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| What is potential energy? |
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Definition
| Stored energy. Determined by position relative to another object |
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| What are examples of potential energy? |
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Definition
a) stretched rubber band
b) compressed spring |
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| Is an object that can do work through chemical action an example of potential energy? Why or why not? |
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| Yes, due to the position of atoms within the substance. |
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| What is gravitational potential energy? |
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| Potential energy of an object due to an elevated position |
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| What does gravitational potential energy equal? |
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Definition
| work done against gravity |
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| What is the equation for gravitational potential energy? |
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Definition
| GPE=(mass)(g,acceleration of gravity)(height) |
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| What is the acceleration of gravity on earth? |
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| If something does 20 J of work then it has lost __________________. |
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| What is the equation for kinetic energy? |
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| KE=1/2(mass)(velocity squared) |
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| What is the law of conservation of energy? |
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Definition
| "Energy cannot be created or destroyed; it may be transformed into a different form" |
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Definition
| Devices for multiplying or changing directions of force |
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| What do machines operate on? |
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Definition
| Law of Conservation of Energy |
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| What is the idea behind efficiency? |
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Definition
| Most energy that goes into a machine is comes out as useful work, some is conserved to thermal energy. |
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| What is the equation for efficiency? |
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| Efficiency=Useful Energy Output/Total Energy Input |
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| What is the work-energy theorem? |
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Definition
| "Work done is equal to the change in kinetic energy" |
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| What is the equation for the work energy theorem? |
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Definition
| (Force)(distance)=1/2(mass)(velocity squared) |
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