Use the number weights to find different ways of balancing the equaliser.

Can you hang weights in the right place to make the equaliser balance?

Can you work out how to balance this equaliser? You can put more than one weight on a hook.

If you have only four weights, where could you place them in order to balance this equaliser?

Can you work out what is wrong with the cogs on a UK 2 pound coin?

What happens when you turn these cogs? Investigate the differences between turning two cogs of different sizes and two cogs which are the same.

Meg and Mo need to hang their marbles so that they balance. Use the interactivity to experiment and find out what they need to do.

Meg and Mo still need to hang their marbles so that they balance, but this time the constraints are different. Use the interactivity to experiment and find out what they need to do.

Mo has left, but Meg is still experimenting. Use the interactivity to help you find out how she can alter her pouch of marbles and still keep the two pouches balanced.

If you were to set the X weight to 2 what do you think the angle might be?

Attach weights of 1, 2, 4, and 8 units to the four attachment points on the bar. Move the bar from side to side until you find a balance point. Is it possible to predict that position?

A ball whooshes down a slide and hits another ball which flies off the slide horizontally as a projectile. How far does it go?

Whirl a conker around in a horizontal circle on a piece of string. What is the smallest angular speed with which it can whirl?

A cone is glued to a hemisphere. When you place it on a table in what position does it come to rest?

George has explained his thinking nicely by looking at all the different combinations.

Tom and Nick had 2 very different approaches to solving this problem. Can you think of any more?

As this is a tool for modelling and investigating the spread of epidemics we will publish any more interesting results sent in.

This article for teachers sets out some ideas for introducing children to some of the concepts at the root of mechanics.

The second of two articles explaining how to include talk in maths presentations.

An article for teachers and pupils that encourages you to look at the mathematical properties of similar games.

Thinking of circles as polygons with an infinite number of sides - but how does this help us with our understanding of the circumference of circle as pi x d? This challenge investigates this relationship.