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11 terms

Motion 2

Physical Science Spierings, RHS Spring 2012
STUDY
PLAY
Weight
the quantity of heaviness, taking into account gravity
Mass
measure of how much matter is in an object
Force
strength put on an object; has direction (is a vector quantity); measured as newtons
Friction
the resistance of one surface has on another object or surface
Gravity
force on an object to tend to fall towards the center of the earth
Newton
a unit to measure force; equals: 1kg * m/s2
Inertia
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: http://bit.ly/zOeFBY