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# Forces and Motion

### Physical Science: Forces and Motion

TermDefinition
Force a push or pull exerted on an object
Newton a unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second
Net force the overall force on an object when all the individual forces acting on it are added together
Unbalanced forces force that produces a nonzero net force, which changes an objectâ€™s motion
Balanced forces equal forces acting on an object in opposite directions
Friction The force that one surface exerts on another when the two surfaces rub against each other
Static friction Friction that acts on abjects that are not moving
Sliding friction friction that occurs when one solid surfaces slides over another
Rolling friction friction that occurs when an object rolls over a surface
Fluid friction friction that occurs as an object moves through a fluid
Gravity the force that pulls objects toward each other
Mass a measure of how much matter is in an object
Weight a measure of the force of gravity on an object
Free fall the motion of a falling object when the only force acting on it is gravity
Air resistance the fluid friction experienced by objects falling through the air
Projectile an object that is thrown
Compression the part of a longitudinal wave where the particles of the medium are close together
Tension stress that stretches rock so it becomes thinner in the middle
Created by: Donu