1. By: Evan Sokolson

2.  Original block and tackle pulley

3.  Modern day block & tackle pulley

4.  Motion because of weight on rope  Elastic because of rope pulling up object  Gravitational if you would set object down

5.  Archimedes invented the block & tackle pulley  Pulleys helped lift heavy objects like cinderblocks & spaceships

6.  http://science.howstuffworks.com/transport/engines-equipment/pulley.htm http://science.howstuffworks.com/transport/engines-equipment/pulley.htm  http://www.worldbookonline.com/advanced/article?id=ar064900&st=block+an d+tackle+pulley http://www.worldbookonline.com/advanced/article?id=ar064900&st=block+an d+tackle+pulley