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Unit 2 - Forces in Motion
Forces in Motion
13
Science
8th Grade
11/26/2012

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Term
reaction force
Definition
force acting in the opposite direction of the action force
Term
acceleration
Definition
a change in speed or direction
Term
Newton
Definition
SI unit for force
Term
balanced force
Definition
forces that are equal in size and do not change motion
Term
inertia
Definition
tendency of an object to stay at rest or in motion: Newton's 1st Law of Motion
Term
action force
Definition
force acting in one direction
Term
reference point
Definition
an object that appears to stay in place
Term
velocity
Definition
the speed of an object in a certain direction
Term
unbalanced force
Definition
force that causes a change in the motion of an object
Term
motion
Definition
change in position over time when compared to a reference point
Term
gravity
Definition
force of attraction between all objects in the universe
Term
force
Definition
a push or pull
Term
speed
Definition
the rate at which an object moves
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