# Shared Flashcard Set

## Details

Matter in Motion
Matter in Motion
14
Physics
08/22/2006

Term
 Motion
Definition
 When an object changes position over time relative to a reference point.
Term
 Speed
Definition
 The distance traveled divided by the time interval during which the motion occurred
Term
 Velocity
Definition
 The speed of an object in a particular direction
Term
 Acceleration
Definition
 The rate at which velocity changes over time; an object accelerates if its speed, direction, or both change.
Term
 Force
Definition
 a push or a pull exerted on an object in order to change the motion of the object; force has size and direction.
Term
 newton
Definition
 the SI unit for force (symbol, N)
Term
 Net Force
Definition
 the combinations of all the forces acting on an object.
Term
 friction
Definition
 a force that opposes motion between two surfaces that are in contact.
Term
 Kinetic friction
Definition
 friction between moving surfaces
Term
 static friction
Definition
 When a force is applied to an object but the object does not move
Term
 gravity
Definition
 a force of attraction between objects that is due to their masses
Term
 Law of Universal Gravitation
Definition
 All objects in the universe attract each other through gravitational force. The size of the force depends on the masses of the objects and the distance between the objects.
Term
 weight
Definition
 a measure of the gravitional force exerted on an object; its value can change with the location of the object in the universe.
Term
 mass
Definition
 a measure of the amount of matter in an object
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