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# Forces Vocabulary

TermDefinition
force a push or pull exerted by one object on another, possibility causing a change in motion
contact force a force that is exerted only when objects are touching
noncontact force a force exerted when objects are not touching
net force the combination of all forces acting on an object
balanced forces forces that act together on an object without changing its motion
unbalanced forces forces that act together on an object and cause its motion to change
gravity the force of attraction among all objects
Law of Universal Gravitation developed by Isaac Newton; states that all objects are attracted to each other by a gravitational force that depends on the mass of each object and distance between them.
friction a force that opposes the motion of an object in contact with a surface
static friciton friction that keeps objects from moving
sliding friction force that opposes the sliding of an object of a surface
rolling friction force that opposes the motion of a wheel turning along a surface
fluid friction friction between a surface and any material, such as water or air, that flows
air resistance fluid friction between a surface and the air
elastic force force exerted by a material when it is stretched or compressed
tension force pulling force applied to an object that can make the object stretch
compression force a squeezing force applied to an object that can make an object shrink
normal force force exerted by an object that is perpendicular to the surface of the object
Newton's First Law Law that states an object at rest tends to stay at rest, and an object in motion tends to stay in motion, unless acted upon by an unbalanced force.
Newton's Second Law Law that states that acceleration depends on the object's mass and the amount of net force applied to it.
Newton's Third Law Law that states when one object exerts a force on a second object, the second object exerts an equal force in the opposite direct on the first object.
momentum combination of the mass and speed of an object
conservation of momentum the principle of total momentum not changing when objects collide
action force the push of the first object on a second
reaction force the push of the second object back on the first object
weightlessness state of being without detectable weight
inertia the tendency of a moving object to keep moving in a straight line
Created by: lwaguespack1