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# Motion and Forces

TermDefinition
reference point an object that appears to stay in place
motion when an object changes position over time when compared to a reference point
speed the rate at which an object moves
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes
deceleration acceleration in which velocity decreases
centripetal acceleration acceleration that occurs in a circular motion
force a push or a pull on an object
newton (N) The SI Unit of force
net force the force that results from combining all the forces exerted on an object
unbalanced force forces on an object that cause the net force to be a number other than zero
balanced force forces on an object that cause the net force to be zero
contact force forces exerted on objects when objects touch
non-contact force forces that are exerted on objects without touching the objects
friction a force that opposes motion between two surfaces that are touching
sliding friction a force that opposes motion when two surfaces slide past each other
rolling friction a force that opposes motion when an object is on rollers or wheels
fluid friction a force that opposes motion in a fluid, such as liquids or gases
static friction a force that opposes motion when a force is applied to an object and the object does not move
lubricant a substance applied to surfaces to reduce the friction between them
gravity a force of attraction between objects that is due to their masses
weight a measure of the gravitational force exerted on an object
mass the amount of matter that something is made of
law of universal gravitation law that states that all objects in the universe attract each other through gravitational force ; depends on their masses and the distance between them
Created by: pdobias