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    <name>
      <text>6.4.8 (Find force on car 2)</text>
    </name>
    <questiontext format="moodle_auto_format">
      <text><![CDATA[<p>A {@mm@}kg car moving at {@vv@}m/s takes a turn around a circle with a radius of {@rr@}m. Determine the net force acting upon the car.</p>

<p>Force = [[input:ans1]] [[validation:ans1]]N</p>]]></text>
    </questiontext>
    <generalfeedback format="moodle_auto_format">
      <text><![CDATA[<p>We seek to use the equations we have derived above. Here we have \(m = {@mm@}, v = {@vv@}, R = {@rr@}\). We can substitute these values into the equation \(a = \frac{v^2}{R}\) to get 
\[
a = \frac{v^2}{R} = \frac{{@vv@}^2}{{@rr@}} = {@aa@} \mbox{ms}^{-1},
\]
Inputting this value into \(F = ma\) gives \(F = {@mm@} \cdot {@aa@} = {@ta1@} N\). Thus the force acting on the car is \({@ta1@}N\).</p>]]></text>
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    <stackversion>
      <text>2020081700</text>
    </stackversion>
    <questionvariables>
      <text>mm: 900+rand([100,-100,200,300,400,500]);
vv: 10+rand([5,10,15,20,25,30]);
rr: 20+rand(10);

aa: vv^2/rr;
ta1: mm*aa;</text>
    </questionvariables>
    <specificfeedback format="html">
      <text>[[feedback:prt1]]</text>
    </specificfeedback>
    <questionnote format="moodle_auto_format">
      <text>mass: {@mm@}, acceleration {@aa@}, speed = {@vv@}, radius = {@rr@}, force = {@ta1@}.</text>
    </questionnote>
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      <text/>
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      <text><![CDATA[<span style="font-size: 1.5em; color:orange;"><i class="fa fa-adjust"></i></span> Your answer is partially correct.]]></text>
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      <text><![CDATA[<span style="font-size: 1.5em; color:red;"><i class="fa fa-times"></i></span> Incorrect answer.]]></text>
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    </qtest>
  </question>
</quiz>
