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14 Cards in this Set
- Front
- Back
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What is energy?
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The property of a system that allows it to do work
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A combination of energy and ___ make up the universe.
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Matter
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What is matter?
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Substance we can see, smell, and feel
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What is work?
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A measure that involves force and distance (w=fd) and essentially yields the application of force, and movement onto the object the force is being applied to.
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How much more work is being done when lifting 2 loads 1 story high versus lifting 1 load the same vertical distance?
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Twice the amount of work, because the amount of force needed increases.
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What is power?
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Measure of how fast work is done. (Power= work done / time interval)
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What are the two types of mechanical energy?
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Kinetic and Potential energy
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What is Potential energy?
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Stored energy held in readiness with a potential for doing work
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What is gravitational potential energy?
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Potential energy due to elevated position
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What is kinetic energy?
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Energy of motion. Depends on the mass of the object and square of its speed
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What is the Work energy theorem?
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Gain or reduction of energy is the result of work (W=changeinKE).
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Law of conservation of energy
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Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes.
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What is a machine?
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Device for multiplying forces or changing the direction of forces
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What is efficiency?
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Percentage of work put into a machine that is converted into useful work output
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