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35 Cards in this Set
- Front
- Back
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The name given to force applied to make an object move a distance is....
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work
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F x d =
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Work
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F x d / t =
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Power
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Work / time =
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Power
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Joule, kg m^2 / s^2, and N.m are all units of ....
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work and energy
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Energy is the ability to do....
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work
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If a spring has a low value for its constant, then that spring, when loaded, has a____ PE than a spring with a high k value.
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lower
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PE of a spring = ....
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1/2 kx²
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The x in spring formulas represents....
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distance that the spring is stretched of compressed.
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What is a practical unit for the spring constant?
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N / m
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Change in KE, change in PEg, change in PEs all required that ____ be done.
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work
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Potential energy gravitational is...
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energy of position; energy it possesses merely by being up high
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Formula for PEg =
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m g h
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Sum of PEs, PEg, and KE before an interaction must be equal to ....
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Sum of the same energies after the interaction
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J / s is a unit of....
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Power
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J / s is the same as a unit called
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Watts
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kg m² / s² is a unit for ___ or ____
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Work or energy
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Kg m² / s³ is a unit for ____
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Power
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Kg m² / s³ is another way of writing the unit called....
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watts
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Kg m² / s² is another way of writing the unit called ___ or ____.
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Joule or N m
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If a force is pulling a wagon, but is being applied to a handle making an upward angle with the horizontal, then which force must be found to determine work done on the wagon?
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The horizontal component of force
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Which trig function is needed to find the horizontal component of force on the handle of a wagon that is being pulled along at an angle between 0 & 90 degrees ?
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cosine
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Kinetic energy is merely ....
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Energy as a result of an object in motion
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How is KE calculated?
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1/2 mv²
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For an object being lifted to a height, the weight of the object comprises which parts of the PEg formula?
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The mg part
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What relationship exists between force and the spring constant?
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direct
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When force is plotted on the y-axis, and distance stretched on the x-axis, what is the shape of the graph?... and what is the constant for the graph?
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Linear; spring constant k
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Spring constant is a measure of the ____ of the spring.
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stiffness
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How is the spring constant related to the distance a spring is stretched?
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Inversely
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Why do spring scales work?
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Linear relationship between F and distance stretched
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Force on a spring is 10 N. Spring constant is 5 N/m. How far does the spring stretch?
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2 m
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On a roller coaster, where is the KE the greatest?
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At the bottom of a hill
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What is the relationship between power and work?
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Direct
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How will a car with 2000 watts of power get a job done compared to a car with 1000 watts of power?
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Twice as fast
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T/F -- spring constants indicate the resistance in the spring
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true
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