Replace three tangential forces with an equivalent force-couple system acting at the center of a circle.

Homework set.  Calculate resultant moment of one or more couples. 

Find the sum of two couples in a plane.

Find the moment of a couple formed by two equal and opposite forces.

This shows how to define a list of LaTeX strings, and pick a couple of them at random to display.

The "JSON data" type is used to define the available strings, so they're automatically marked as "safe" and curly braces aren't interpreted as variable substitution.

Replace two forces with a equivalent force-couple system at a specified point.

A couple of questions. Some hard, some easy.

Determine the single force which is equivalent to a force and a couple.

Solve for an angle which will result in equilibrium for a triangle subjected to three couples.   A trial and error solution is recommended.

Given the first few terms of an arithmetic sequence, write down its formula, then find a couple of particular terms.

A couple of different ways of showing the correct answer to a single part as soon as the student submits an answer. One way allows the student to change their answer, while the other locks the part.

A third part includes a "reveal answers to this part" button, which allows the student to choose to reveal the answer to the part.

Think very carefully before using this: by revealing the answer, you are removing the opportunity for the student to later on realise they've got that step wrong, as a consequence of some further work. It's often possible to use adaptive marking to use the student's answer in place of the correct answer in later parts.

A couple of different ways of asking the student to enter a large number, to get around the floating point imprecision problem.

Calculate the Pearson correlation coefficient and conduct a hypothesis test.

Expression of the (a+bx)^n is given and a couple of coefficients are asked for.

A quadratic function is given. The graph of the function is drawn with three coordinates on the graph, without any x or y ticks.  The $x$ coordinate is given for a couple and $y$ coordinate given for the third, and coordinates are asked for.

Given the first few terms of an arithmetic sequence, write down its formula, then find a couple of particular terms.

Given the first few terms of an arithmetic sequence, write down its formula, then find a couple of particular terms.

Given the first few terms of an arithmetic sequence, write down its formula, then find a couple of particular terms.

A couple of multiplication tables to be completed. Numbers to be multiplied are generated randomly. Single digit multiplication recall.

Given the first few terms of an arithmetic sequence, write down its formula, then find a couple of particular terms.

A couple of different ways of asking the student to enter a large number, to get around the floating point imprecision problem.

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Three items of work done on a car. Given total price, and a couple of ratios of prices between pairs of items, work out the cost of one of the items.

Based on question 4 from section 3 of the Maths-Aid workbook on numerical reasoning.

Three items of work done on a car. Given total price, and a couple of ratios of prices between pairs of items, work out the cost of one of the items.

Based on question 4 from section 3 of the Maths-Aid workbook on numerical reasoning.