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26 Cards in this Set
- Front
- Back
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displacement
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a measurement of the change in position of a moving body; a straight line connecting the start and end points is specified in terms of length and direction
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distance
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a measurement of how far apart objects are
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error
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the difference between the value that is measured and the actual measurement
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gradient
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slope of a hill of a graph
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instantaneous speed
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the speed of an object at a particular moment
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precision
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how close measured values are to each other
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random error
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error that changes
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reaction distanc
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distance moved while reacting to an emergency
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reaction time
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the length of time it takes a driver to respond to a hazard
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scalar quantity
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a quantity, such as distance or time that has size but not direction
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speed
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the rate of change of distance
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systematic error
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error that always differs by the same amount
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vector quality
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a quantity, such as displacement or velocity, that has size and direction
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velocity
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the rate of change of displacement
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inertia
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the tendency of an object to resist changes in its motion
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newton's first law of motion
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an object at rest will remain this way unless it is acted upon by an unbalanced force; an object that is moving will continue to move in the same manner unless acted upon by an unbalanced force
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newton's second law of motion
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an object will accelerate in the direction of an unbalanced force acting upon it such that f=mxa
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newton's third law of motion
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for every action, there is an equal and opposite reaction
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efficiency
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a measure of the useful energy output of an energy transfer
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elastic potential energy
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energy stored in a stretched or compressed material, such as a spring or elastic band
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gravitational potential energy
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the potential energy possessed by an object due to its position above the ground
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kinetic energy
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the energy of a moving body
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law of conservation of energy
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energy may be transferred but is never created or destroyed
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potential energy
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energy possessed by an object because of it's position or structure, also called stored energy
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power
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the rate at which work is done; measured in watts (W)
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work
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the energy transferred b a force that acts over a certain distance; measured in joules (J)
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