The construction of bridges, buildings, roads and other structures requires scientific knowledge of the properties of materials, measurement of forces and good mathematical skills! Engineering projects could include constructing a bridge that holds weight, a container that withstands the force of dropping from a height or designing a vehicle that can travel up an incline.

The Egg-Drop experiment

During egg drop experiments, people usually design a "packaging for an egg", place the egg in the packaging, and drop it from a certain height. The goal is to wind up with an unbroken egg!
You want to think about a few things:
1) Can you slow the egg package's flight down so that it doesn't crash into the ground (this is the same as creating air resistance). Think about how humans do this when they jump out of an airplane - they use parachutes!
2) You don't want your package to be too heavy or it will just CLUNK.
3) You want to cushion you package egg to that the shock of hitting the ground doesn't hurt the egg. If you put too much cushion around the egg itself, then the egg may absorb the shock instead of the cushion, so think about cushioning the package.

Construct a Bridge to support the greatest mass

How Bridges Work - From the great science site "How Stuff Works" , information about three major types of bridge.
Building Big - Bridge Basics - From the PBS site, more theory about types of bridges.
Model Bridge Design - This extensive site has some great information about constructing model bridges - the different types of bridge and construction methods, including photos.
ABCD's Bridge Design Tips - Tips for bridge building from an engineer - styles, materials, fixings and photos.

Timothy S. did a science fair project to investigate which structure holds the greatest mass?.

This student did an investigation to find out "Which bridge design supports the most weight?"

Kush, from Mrs Laguna's Team8 class, did a project about composite materials: