By: Natalie Worcester &

Abigail Papka

Close an envelope with a stamp

(It’s not that weird)

Dominoes Marble track Mouse trap (the game) Mouse trap (a real one) Small books Four marbles A stool Stamp An envelope A toy car

A board (linoleum) A board (wood) A camera Funnels Plastic pipe Two pulleys About 15 feet of string Masking tape

Mechanical advantage Friction

We used seven simple machines- Screw, spring, incline plane, wedge, lever, wheel and axel, pulley

We wanted to close an envelope