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Chapter 5Matter in Motion
Physical Science
17
Science
8th Grade
12/08/2011

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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 for motion
Term
Speed
Definition
the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
Term
Velocity
Definition
the speed of an object in a particular direction
Term
Acceleration
Definition
the rate at which velocity changes; an object accelerates if its speed changes, if its direction changes, or if both its speed and direction change
Term
Deceleration
Definition
acceleration in which velocity decreases
Term
Force
Definition
a push or pull; all forces have both size and direction
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 between two forces that are touching
Term
Energy
Definition
the ability to do work
Term
Potential Energy
Definition
the energy of position or shape
Term
Kinetic Energy
Definition
the energy of motion; kinetic energy depends on speed and mass
Term
The Law of Conservation of Energy
Definition
the law states that energy is neither created nor destroyed
Term
Gravity
Definition
a force of attraction between objects that is due to their masses
Term
Weight
Definition
a measure of gravitational force that is exerted on an object, usually by the earth
Term
Mass
Definition
the amount of matter that something is made of
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