How a Screw Works: VIDEO/DVD, Compare the amount of work needed to remove a nail from a board with the amount of force required to remove a screw. Screws and nails are really different simple machines; the screw is a wedge wrapped around a cylinder and exerts force in several directions just as an ordinary wedge does.


			How a Screw Works

Compare the amount of work needed to remove a nail from a board with the amount of force required to remove a screw. Screws and nails are really different simple machines; the screw is a wedge wrapped around a cylinder and exerts force in several directions just as an ordinary wedge does. (7 minutes)

ORDER CODE: FFMBVL1641V
VHS VIDEO

ORDER CODE: FFMBVL1641DVD
DVD