## Science Chapter 9 and 10

##### Created by:

haffelyl  on October 25, 2011

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# Science Chapter 9 and 10

 motionthe state in which one object's distance from another is changing
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#### Definitions

motion the state in which one object's distance from another is changing
reference point a place or object used for comparison to determine if an object is in motion
meter the basic SI unit of length
speed the distance an object travels per unit of time
average speed the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time.
instantaneous speed the speed of an object at one instant of time
velocity speed in a given direction
slope the steepness of a line on a graph, equal to its vertical change divided by its horizontal change
acceleration the rate at which velocity changes
force a push or pull exerted on an object
net force the overall force on an object when all the individual forces acting on it are added together
unbalanced force forces that produce a nonzero net force, which changes an object's motion
balanced force equal forces acting on an object in opposite directions
inertia the tendency of an object to resist any change in its motion
mass a measure of how much matter is in an object
newton a unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second
friction force that one surface exerts on another when the two surfaces rub against each other
sliding friction friction that occurs when one solid surface slides over another
rolling friction friction that occurs when an object rolls over a surface
fluid friction friction that occurs as an object moves through a fluid
gravity the force that pulls objects toward each other
free fall the motion of a falling object when the only force acting on it is gravity
projectile an object that is thrown
air resistance the fluid friction experienced by objects falling through the air
terminal velocity the greatest velocity a falling object can achieve
weight a measure of the force of gravity on an objects
momentum the product of an object's mass and velocity
satellite any object that orbits around another object in space
centripetal force a force that causes an object to move in a circle

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