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Annotation of loncom/homework/templates/functionplotvector.problem, revision 1.1

1.1     ! www         1: <problem>
        !             2: <script type="loncapa/perl">$slope=&random(0.5,0.8,0.1);
        !             3: $function="2+$slope*x";
        !             4: $massx=&random(3.5,6.5,0.1);
        !             5: $massy=2.1+$slope*$massx;
        !             6: $angle=180.*atan($slope)/$pi;
        !             7: $perp=$angle+90.;</script>
        !             8: <startouttext />
        !             9: A mass is sliding down the indicated incline with a constant velocity. Construct the free body diagram, making sure the forces are approximately proportionally correct. Leave unused vectors unattached.<br /> <endouttext />
        !            10: <functionplotresponse xaxisvisible="no" xlabel="x" gridvisible="yes" ylabel="y" id="11" xmax="10" yaxisvisible="no" xmin="0" ymin="0" ymax="10" width="450" height="450">
        !            11: <functionplotelements>
        !            12: 
        !            13: <backgroundplot function="$function" fixed="yes" />
        !            14: <plotobject label="Mass" x="$massx" y="$massy" />
        !            15: <plotvector label="Gravity" tailx="6" taily="1" tipx="9" tipy="1" />
        !            16: <plotvector label="KineticFriction" tailx="6" taily="2" tipx="9" tipy="2" />
        !            17: <plotvector label="StaticFriction" tailx="6" taily="3" tipx="9" tipy="3" />
        !            18: <plotvector label="NormalForce" tailx="6" taily="4" tipx="9" tipy="4" />
        !            19: 
        !            20: </functionplotelements>
        !            21: <functionplotruleset>
        !            22: <functionplotvectorrule index="Grav" vector="Gravity" attachpoint="Mass" angle="270" angleerror="2" />
        !            23: <functionplotvectorrule index="Norm" vector="NormalForce" attachpoint="Mass" angle="$perp" angleerror="3" />
        !            24: <functionplotvectorrule index="KFriction" vector="KineticFriction" attachpoint="Mass" angle="$angle" angleerror="2" />
        !            25: <functionplotvectorrule index="SFriction" vector="StaticFriction" notattachpoint="Mass" />
        !            26: <functionplotvectorsumrule vectors="Gravity,NormalForce,KineticFriction" length="0" lengtherror="1" index="Total" />
        !            27: </functionplotruleset>
        !            28: <hintgroup showoncorrect="no">
        !            29:     
        !            30: <hintpart on="Grav">
        !            31:     <startouttext />Gravity acts on the mass and points straight down.<endouttext />
        !            32: </hintpart>
        !            33: <hintpart on="SFriction">
        !            34:     <startouttext />The mass is sliding.<endouttext />
        !            35: </hintpart>
        !            36: <hintpart on="Total">
        !            37:     <startouttext />What should be the net force on the mass?<endouttext />
        !            38: </hintpart>
        !            39: </hintgroup>
        !            40: </functionplotresponse>
        !            41: </problem>