home *** CD-ROM | disk | FTP | other *** search
/ The Way Things Work: Pinball Science / Pinball Science.iso / mac / Pinball Science Data / Journal / TECHNOTE / SF / SFTN003S.dib (.png) < prev    next >
Bitmap Image  |  1999-02-23  |  72.1 KB  |  222x338  |  8-bit (27 colors)  |  [Data/DKPB]
   ocr: How do forces change velocity? The velocity ofa ball will only change if a force acts on 1t. This may seem strange, as a ball thati rolls along the floor will in time cone to ahalt. However, the ball stops because a force called triction 1S acting on 1t. Without triction, the ball would continue. rolling at the same velocity until it hit a wall. The idea that an object will only change its velocity ifa force acts on it was first thought ofby Sir Isaac Newton more than 300 years ago. The rule 1S now known as "Newton's first law ofmotion. a