Conceptual
Bridges
Cable-stay bridges are
suspended road beds held up mostly by wires and a large column which it is
attached to.
Arch bridges are thick at the ends and thin in the middle
for support purposes for the longer road bridges. They hold up the road with
wires.
Moveable things
Gears - very useful
when having to move things but only able to move it in one direction.
Wheels – useful
way of making things move but very hard to apply it.