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Student Name: _______________________________ Mrs. Lee – 8th Grade Physical Science Period #: ______ Date: _____________ Chapter 10 Vocabulary: Forces Newton: The SI unit used for the magnitude, or strength, of a force (p 377) Unbalanced forces: Forces that cause an object’s velocity to change (p 378) Friction: The force that one surface exerts on another when the 2 surfaces rub against each other (p 383) Sliding friction: Friction that occurs when one solid surface slides over another (p 384) Force: A push or pull exerted on an object (p 376) Net force: The overall force on an object when all the individual forces acting on it are added together (p 377) Balanced forces: Equal forces acting on an object in opposite directions (p 378) Static friction: Friction that acts on objects that are not moving (p 384) Fluid friction: Friction that occurs as an object moves through a fluid (p 384) Mass: A measure of how much matter is in an object (p 386) Free fall: The motion of a falling object when the only force acting on it is gravity (p 388) Projectile: An object that is thrown (p 390) Rolling friction: Friction that occurs when an object rolls over a surface (p 384) Gravity: The force that pulls objects toward each other (p 386) Weight: A measure of the force of gravity on an object (p 387) Air resistance: The fluid friction experienced by objects falling through the air (p 389) Tension: An elastic force that stretches or pulls on the molecules in matter (p 390) Conservation of momentum: The rule that in the absence of outside forces the total momentum of objects that interact does not change (p 397) Satellite: Any object that orbits around another object in space (p 405) Compression: An elastic force that squeezes or pushes the molecules in matter together (p 390) Inertia: The tendency of an object to resist any change in its motion (p 392) Momentum: The product of an object’s mass & velocity (p 398) Centripetal force: A force that causes an object to move in a circle (p 405)