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# Chapter Nine

motion the state in which one object's distance from another is changing
reference point is a place or object used for comparison to determine if something is in motion
distance is the length of a path between two points
displacement is the length and direction that an object has moved from it starting point
vector a quantity that consists of both a magnitude and a direction
speed is the distance the object travels per unit of time S= D/T
average speed divide the total distance traveled by the total time
instantaneous speed is the rate at which an object is moving at a given instant in time
velocity is speed in a given direction
slope the steepness of a line on a graph...Slope= rise/run
acceleration as the rate at which velocity changes with time. Acceleration= Final Velocity- Initial velocity/ Time
Work is done when an object is caused to move a certain distance
energy the ability to do work or cause change
Kinetic energy energy of motion...KE= 1/2 x Mass x Speed squared
Potential energy Stored energy that results from the position or shape of an object
Gravitational Potential Energy potential energy release to an object's height GPE= Weight x Height
Mechanical energy an object's combined kinetic energy and potential energy ME= KE + PE
Law of Conservation of energy states when one form of energy is transformed to another no energy is created is destroyed
Elastic potential energy the potential energy of objects that can be stretched or compressed.
Created by: gayledains