Physics: Principles and Problems

Chapter 4: Forces in One Dimension

Problem of the Week

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  Use Newton's second law of motion to determine the force:
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<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078458137/193800/POWproblem2.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a> A long barrel allows the force from the cannon (air) to act on the bird a relatively longer time. Once the bird exits the barrel, the cannon can no longer push on the bird. If the cannon has a shorter barrel, the force acts on the bird a shorter time. For the greatest final velocity, the longer the acceleration the better. To obtain long acceleration, you want a long barrel.
 
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