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chapter 5
matter in motion
17
Science
8th Grade
12/15/2010

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Term
Motion
Definition
an object's change in position over time when compared with a reference point
Term
reference point
Definition
an object that appears to stay in place in relation to an object being observed formotion
Term
speed
Definition
the rate at which an object moves
Term
velocity
Definition
the speed of and object in a particular direction
Term
accelereation
Definition
the rate at which velocity changes
Term
deceleration
Definition
Term
force
Definition
a push or pull
Term
newton (n)
Definition
the si unit of force
Term
net force
Definition
the force that results from combining all the forces exerted on an object
Term
friction
Definition
a force that opposes motion betweeen 2 surfaces that are touching
Term
energy
Definition
the ability to do work
Term
potential energy
Definition
the energy or postion or shape
Term
kinetic energy
Definition
the energy of motion
Term
the law of conservation of energy
Definition
the law that states thta energy is neither create dor destroyed
Term
gravity
Definition
a force of attraction between objects that is due to their masses
Term
weight
Definition
a measure of the gravitational force exerted on an object
Term
mass
Definition
the amount of matter that somthing is made of
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