# lab8 - v = v u u u t r F c m From this equation we can see...

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Lab 8: Circular Motion SAR Physics A M Kolchin Purpose : To investigate how the linear speed of an object an object in circular motion depends on 1. the centripetal force applied ( F c ) 2. the object’s mass ( m ) 3. the radius of the orbit. ( r ) Theory : An object in uniform circular motion, moves in a cir- cle at a constant linear speed, maintaining a constant radius from the center about which it revolves. An object moving in this way is constantly changing the direction of its linear speed due to some inwardly di- rected force, which we call the centripetal force . 1

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The centripetal force causes a centripetal (inwardly directed) centripetal acceleration for which we state the formula: a c = v 2 r From Newton’s second law ( F = ma ), the centripetal force is: F c = m v 2 r If we solve the above equation for v we have:
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Unformatted text preview: v = v u u u t r F c m From this equation, we can see how v should change when we change either F c , r , or m . In this lab, we will see how well the equation is obeyed by our equip-ment by measuring v while varying the other three properties. 2 Materials : 1. stopwatch 2. meter stick 3. electronic balance 4. nylon string 5. hanging masses ( M ’s to provide F c ) 6. rubber stoppers ( m ’s; the objects in circular mo-tion) Procedure: The class will be split into three types of groups: • GROUP I: Will measure v while varying m and keeping F c and r constant. • GROUP II: Will measure v while vary-ing F c and keeping r and m constant. • GROUP III: Will measure v while vary-ing r and keeping F c and m constant. 3...
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lab8 - v = v u u u t r F c m From this equation we can see...

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