# Concave lenses diverge light diffraction is when

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Concave lenses diverge light.Diffraction is when light waves strike an obstacle and new waves areproduced.Interference takes place when two or more waves overlap and combine asa result of diffraction.Revised June 2013Science Standards of LearningCurriculum Framework 2010Physical Science – Page 24
Standard PS.10PS.10The student will investigate and understand the scientific principles of work, force, and motion. Key concepts includea)speed, velocity, and acceleration;b)Newton’s laws of motion;c)work, force, mechanical advantage, efficiency, and power; andd)technological applications of work, force, and motion.OverviewStandard PS.10 builds upon the concepts of simple machines, force, and work introduced in science standards 3.2 and 4.2. StandardPS.10 reviews and expands these basic ideas and introduces students to more mathematical concepts of motion. It is intended thatstudents will actively develop scientific investigation, reasoning, and logic skills, and the nature of science (PS.1) in the context ofthe key concepts presented in this standard.Science Standards of LearningCurriculum Framework 2010Physical Science – Page 25
Standard PS.10PS.10The student will investigate and understand the scientific principles of work, force, and motion. Key concepts includea)speed, velocity, and acceleration;b)Newton’s laws of motion;c)work, force, mechanical advantage, efficiency, and power; andd)technological applications of work, force, and motion.Essential UnderstandingsEssential Knowledge, Skills, and ProcessesThe critical scientific concepts developed in this standard include thefollowing:Acceleration is the change in velocity per unit of time. An object movingwith constant velocity has no acceleration. A decrease in velocity isnegative acceleration or deceleration. A distance-time graph foracceleration is always a curve. Objects moving with circular motion areconstantly accelerating because direction (and hence velocity) isconstantly changing.Newton’s three laws of motion describe the motion of all commonobjects.Mass and weight are not equivalent. Mass is the amount of matter in agiven substance. Weight is a measure of the force due to gravity acting ona mass. Weight is measured in newtons.A force is a push or pull. Force is measured in newtons. Force can causeobjects to move, stop moving, change speed, or change direction. Speed isthe change in position of an object per unit of time. Velocity may have apositive or a negative value depending on the direction of the change inposition, whereas speed always has a positive value and is nondirectional.Work is done when an object is moved through a distance in the directionof the applied force.A simple machine is a device that makes work easier. Simple machineshave different purposes: to change the effort needed (mechanicaladvantage), to change the direction or distance through which the force isapplied, to change the speed at which the resistance moves, or acombination of these. Due to friction, the work put into a machine is

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