2) Ray decides to paint the outside of his uncle's house. He uses a 4.0-m-long boardsupported by vertical cables at each end to paint the second floor. The board has amass of 21 kg. Ray (70 kg) stands 1.0 m from the left cable. What are the forces thateach cable exerts on the board?Ability A1: Can extract the information from representation correctlyNeeds WorkSome of the information isextracted correctly, but notall of the information. Forexample, physicalquantities are representedwith numbers there are nounits. Or directions aremissing. Subscripts forphysical quantities areeither missing orinconsistent.AdequateAll necessary information hasbeen extracted correctly andwritten in a comprehensibleway. Objects, systems,physical quantities, initialand final states, etc. areidentified correctly and unitsare correct. Physicalquantities have consistentsubscripts.AdequateThe diagram contains noerrors and each force islabeled so that it is clearlyunderstood what each forcerepresents.AdequateMathematical representationis represented symbolically(not just using numbers) andapplies appropriate physicsconcepts to the situation. Themathematical representationis evaluated for itsappropriateness andconsistency.Ability A5: Is able to construct a force diagramInadequateNeeds WorkFD contains no errors invectors but lacks a keyfeature such as labels offorces with two subscriptsor vectors are not drawnfrom single point, orcomponents are drawninstead of forces.InadequateInformation that is extractedcontains errors such aslabeling quantitiesincorrectly, mixing up initialand final states, choosing awrong system, etc. Physicalquantities have nosubscripts (when those areneeded).FD is constructed butcontains major errors suchas incorrect mislabeled ornot labeled force vectors,length of vectors, wrongdirection, extra incorrectvectors are added, orvectors are missing.Ability A9: Is able to represent a situation with mathematicsNeeds WorkInadequateMathematicalrepresentation isrepresented symbolically(not just using numbers) andapplies appropriate physicsconcepts to the situation. Noevaluation of the math in theproblem is present.Mathematicalrepresentation lacks thesymbolic part (the studentplugged the numbers rightaway) has the wrongconcepts being applied, orsigns are incorrect.MissingNo visible attempt is madeto extract information fromthe problem text.MissingNo representation isconstructed.MissingNo representation isconstructed.

Given That Length of the board = 4.0m Mass Of the Board =…

2) Ray decides to paint the outside of his uncle's house. He uses a 4.0-m-long board supported by vertical cables at each end to paint the second floor. The board has a mass of 21 kg. Ray (70 kg) stands 1.0 m from the left cable. What are the forces that each cable exerts on the board? Ability A1: Can extract the information from representation correctly Needs Work Some of the information is extracted correctly, but not all of the information. For example, physical quantities are represented with numbers there are no units. Or directions are missing. Subscripts for physical quantities are either missing or inconsistent. Ability A5: Is able to construct a force diagram Inadequate Adequate All necessary information has been extracted correctly and written in a comprehensible way. Objects, systems, physical quantities, initial and final states, etc. are identified correctly and units are correct. Physical quantities have consistent subscripts. Adequate The diagram contains no errors and each force is labeled so that it is clearly understood what each force represents. Adequate Mathematical representation is represented symbolically (not just using numbers) and applies appropriate physics concepts to the situation. The mathematical representation is evaluated for its appropriateness and consistency. Needs Work FD contains no errors in vectors but lacks a key feature such as labels of forces with two subscripts or vectors are not drawn from single point, or components are drawn instead of forces. Inadequate Information that is extracted contains errors such as labeling quantities incorrectly, mixing up initial and final states, choosing a wrong system, etc. Physical quantities have no subscripts (when those are needed). FD is constructed but contains major errors such as incorrect mislabeled or not labeled force vectors, length of vectors, wrong direction, extra incorrect vectors are added, or vectors are missing. Ability A9: Is able to represent a situation with mathematics Needs Work Inadequate Mathematical representation is represented symbolically (not just using numbers) and applies appropriate physics concepts to the situation. No evaluation of the math in the problem is present. Mathematical representation lacks the symbolic part (the student plugged the numbers right away) has the wrong concepts being applied, or signs are incorrect. Missing No visible attempt is made to extract information from the problem text. Missing No representation is constructed. Missing No representation is constructed.