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Physical Science Spierings, RHS Spring 2012


the quantity of heaviness, taking into account gravity


measure of how much matter is in an object


strength put on an object; has direction (is a vector quantity); measured as newtons


the resistance of one surface has on another object or surface


force on an object to tend to fall towards the center of the earth


a unit to measure force; equals: 1kg * m/s2


a characteristic of matter which states the object will continue in its existing state of rest or motion unless an outside force acts on it (Latin word means lazy)

Negative Acceleration

when acceleration is in a direction opposite to the velocity or in the direction of the negative axis on the velocity vs. time graph

Positive Acceleration

when the velocity vs. time graph has a positive slope; velocity is increasing

Instantaneous Speed

the speed at a given moment (ex: a car's speedometer)

Average Speed

calculated using the total distance traveled and the total time traveled
Web to show the difference between instantaneous &average speed:

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