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PS-Ch5

Physical Science Chapter 5 - Matter in Motion (Vocab)

QuestionAnswer
an object's change in position relative to a reference point motion
the distance traveled divided by the time interval during which the motion occurred speed
the speed of an object in a particular direction velocity
the rate at which velocity changes over time; this happens if an object's speed, direction, or both change acceleration
a push or a pull exerted on an object in order to change the motion of the object; it has size and direction force
the SI unit for force newton (N)
the combination of all of the forces acting on an object net force
when the forces on an object produce a net force of 0 N balanced forces
when the forces on an object does not produce a net force of 0 N unbalanced forces
a force that opposes motion between two surfaces that are in contact friction
friction between moving surfaces kinetic friction
a type of friction; when a force is applied to an object but does not cause the object to move static friciton
substances that are applied to surfaces to reduce friction between the surfaces lubricants
a force of attraction between objects that is due to their masses gravity
a law that states that all objects in the universe attract each other through gravitational force law of universal gravitation
a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe weight
a measure of the amount of matter in an object mass
two parts of law of universal gravitation ①Gravitational force increases as mass increases. ②Gravitational force decreases as distance increases.
Created by: diane3475
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