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Chapter 5

Matter in Motion

TermDefinition
Motion An object's change in position over time.
Speed The distance traveled divided by the time it takes to travel the distance.
Formula for speed speed = distance/time (s=d/t)
Velocity The speed of an object in a specific direction.
Formula for velocity velocity = distance/time (v=d/t)
Acceleration The rate at which velocity changes over time (speeding up, slowing down, or changing direction).
Force A push or a pull exerted on an object
Newton (N) The SI unit for force
Net Force The combination of all forces acting on an object.
Balanced Force When all forces exerted on an object have a net force of 0 N.
Unbalanced Force When all forces exerted on an object DO NOT have a net force of 0 N.
Friction A force that opposes motion between two surfaces that are in contact.
Kinetic Friction The type of friction when something is moving (ie a book sliding across a table).
Static Friction The type of friction when something is not able to move (ie when you push a heavy piece of furniture that does not move).
Gravity A force of attraction between objects that is due to their masses.
Weight A measure of the gravitational force exerted on an object (changes depending location in the universe).
Mass A measure of the amount of matter in an object (does not change regardless of location in the universe).
Created by: Kenmore Science
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