Second+Law

One of the consequences of Newton's Second Law of Motion is that a steady force will produce a steady acceleration. To see this, use the LoggerPro application to take a video clip of an object slowing down due to the steady force of friction. The analytic tools of LoggerPro will let you easily analyze whether the velocity decreased in a steady pattern, as the law predicts. A good video clip will
 * show both ends of the meterstick;
 * show motion from left to right;
 * have a line of sight perpendicular to the meterstick;
 * have a clear view of the cart;
 * show the cart slowing down under the influence of friction alone.
 * Add a video clip showing the dot analysis tool.**

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[|Watch this video] to see a flea pulling a book! (Advance to 4:30 for the flea!)