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Chapter Nine
Question | Answer |
---|---|
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. |