Technology

Bridge

Dead load and live load, because the people pass over it.

Forces: Compression and tension.

Shape: Rectangle.

House

Dead load and live load, people walk over it.

Forces: Compression and tension

   Shape: Triangle and square

Bicycle

1-

R=40/20= 2

Multiplying system, because 2>1

2-

R= 42/20=2,1

Multiplying system, because 2,1>1

Parts of the bicycle: