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39 Cards in this Set
- Front
- Back
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What is the product of the magnitudes of the component of a force along the direction of the displacement and the displaacement?
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Work
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Work is only performed on an object if...
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the object is moved because of the force
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Only components of a force ___ to displacement perform work
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parallel
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A conserved energy quantity is one that remains...
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Constant
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Like mass, ____ is a conserved quantity
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Energy
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The ____ of some objects involve potential and kinetic energy
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Motion
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What is the sum on kinetic and potential energy?
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Mechanical energy
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Clocks with pendulums involve...
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Kinetic, and gravitational and elastic potential energy
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Does nuclear, thermal, and electrical energy involve mechanical energy?
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No, not motion
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Total mechanical energy remains the same if...
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There is no friction
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The amount of energy stays constant, but what may happen to it?
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Form change
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In the case of no friction, what formula can be made?
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Final mechanical energy equals intuitive mechanical energy
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What affect does friction have on mechanical energy?
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Causes some of it to change or "be lost" into thermal energy
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What is the energy associated with an object in motion?
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Kinetic Energy
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Like work kinetic energy is a scalar quantity and has units of ___.
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Joules
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Kinetic energy depends on __ and __
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Speed and mass
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The net work done by a net force acting on an object is equal to the change in ___ of the object
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Kinetic energy
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Kinetic energy can be thought of as work an object can do as it comes to ___, or the amount of energy ___ in an object
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rest, stored
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What is the energy associated with an object due to the position of the obect relative to another object?
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Potential energy
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Potential energy is associated with an object due to the position of the object relative to the ___ or some other ___
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Earth, gravatational source
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As it falls, a falling object gains ___
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Kinetic Energy
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Energy from a falling object comes from the ___ and is associated with an objects initial position relative to the ground
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Gravataional pottential energy
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The height used in GPE must be relative to a ___
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zero position
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What refers to the potential energy in a stretched or compressed elastic object?
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Elastic potential energy
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What expresses how resistant a spring is to being compressed or stretched?
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The Spring constant
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Spring constants have unites of __-
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N/m
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When a spring constant is high, the spring is ___, when a spring constant is low, the sprig is ___/
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stiff, relaxed
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The length of a spring when it is neither compressed nor stretched is called the ___.
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Relaxed length
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When an external force compresses or stretches a spring, ___ is stored in the spring
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Elastic Potential Energy
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Work can either be positive or negative, depending upon the angle of ___.
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Applied force
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Work is positive whe the angle is between __-__ or __-__
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0-90 or 270-360
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Work is negative when the angle is btween __-__
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90-270
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Whe force is in direction of motion, is it positive or negative work?
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Postivie
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When force opposes motion, is it positive or negative work?
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Negative
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When force is 90 degrees to motion is it positive or negative work?
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Neither
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When an object is not in motion, is it positive or negative work?
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Neither
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What is the rate at which work is done or energy is transferred?
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Power
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What is the SI unit of power?
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Watt
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Differences in power indicate...
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Constant work but changing time
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