Wheelbarrow challenge

Have you ever helped with gardening? Did you use a wheelbarrow? They can be very useful to carry all sorts of things - soil, weeds, grass, cuttings, bricks … Why do you think is it easier to push things in a wheelbarrow than to carry them in your arms?

Levels of difficulty:
Level 1 - Make a simple model of a wheelbarrow.
Level 2 - As level 1, that can carry a book.
Level 3 - As level 1, that can carry a house brick.

Equipment: K’NEX set including small wheels, plus a paperback book and house brick.

Approach: What shape is a wheelbarrow? Where does the wheel go? Where can you put the objects you are carrying? What sort of handles does it have? For level 2, is your wheelbarrow large enough to carry the book? Will it take the weight without breaking or bending too much? For level 3, if your wheelbarrow breaks, how could you make it stronger?

Handy Hints (please click to view):

A2 - 3 ways to connect K'NEX rods and connectors