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Forces and Motion

6th Grade Science

TermDefinition
distance the length between two places.
position the location of an object compared with things around.
motion a change in an object's potions compared to fixed objects around it.
speed how fast an object's position changes with time at any given moment.
velocity a description of a moving object's speed and direction.
acceleration a change in the velocity of an object.
force a push or pull exerted by one object on another, possibly causing a change in motion.
contact force a force that is exerted only when objects are touching.
non contact force a force exerted only when objects are 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.
unblanced forces forces that do not cancel each other out and that cause an object to change its motion
gravity the force of attraction among all objects
friction a force that opposes the motion of an object in contact with a surface.
air resistance the force that opposes the motion of an object through a gas.
elastic force a force exerted by a material when it is stretched or compressed.
tension force a pulling force applied to an object that can make an object stretch.
Newton's first law of motion a physical law stating that an object at rest tends to stay at rest and an object moving in a straight line at a constant speed tend to continue moving that way.
Newton's second law of motion a physical law that states that an object's acceleration depends on the object's mass and the amount of net force applied.
Newton's third law of motion a physical law that states that for every action there is an equal and opposite reaction.
action force the initial push or pull of one object on another object.
reaction force the push or pull of a second object bac on the object that started the push or pull.
Created by: cgrunewald