ÿþ<html> <head> <title>Impulse and Work (MBL) Pre-lab Assignment</title> </head> <body> <SCRIPT LANGUAGE="JavaScript"> function popup1() { OpenWindow=window.open("prelab_impulseenergy_1.html", "win1", "height=500,width=600,toolbar=no,scrollbars=yes,menubar=no,location=no,resizable=yes,screenX=25,screenY=25,top=25,left=25"); } function popup2() { OpenWindow=window.open("prelab_impulseenergy_2.html", "win2", "height=500,width=600,toolbar=no,scrollbars=yes,menubar=no,location=no,resizable=yes,screenX=50,screenY=50,top=50,left=50"); } </SCRIPT> <CENTER><h3>Impulse and Work (MBL) Pre-lab Assignment</h3></CENTER> <p>Your name: _____________________ <p>Please print this page, fill it in, and show it to your TF at the start of your lab session. <p>Part of this experiment involves impulse - an impulse is a change in momentum produced by applying a net force to an object for a particular time interval. The first simulation shows possible motions for an air-hockey puck that is subject to a net force for half a second.</p> <center><p><FORM><INPUT TYPE='BUTTON' VALUE='Simulation 1' onClick='popup1()'></FORM></p></center> <p>Which of the motions shows correctly what an air hockey puck would do if it was initially moving in the x-direction, and was then briefly subjected to a net force in the y-direction? </p> <p> <table cellpadding=6> <tr align=center> <td> &nbsp; &nbsp; &nbsp; &nbsp; 1 </td> <td> &nbsp; &nbsp; &nbsp; &nbsp; 2 </td><td> &nbsp; &nbsp; &nbsp; &nbsp; 3</td> <td> &nbsp; &nbsp; &nbsp; &nbsp; 4 </td></tr> </table> <p>The second part of this experiment involves work, which has units of energy. Consider rolling a cart down an incline. The simulation below shows this situation. In this simulation, energy graphs are plotted as a function of time. <center><p><FORM><INPUT TYPE='BUTTON' VALUE='Simulation 2' onClick='popup2()'></FORM></p></center> Two curves, showing different kinds on energy, are shown in the graph below the simulation. Identify each. <p> <table cellpadding=8> <tr align=center> <td>The red curve is the: <td> gravitational potential energy <td> kinetic energy </tr> <tr align=center> <td>The green curve is the: <td> gravitational potential energy <td> kinetic energy </tr> </table> <p>Briefly explain how you know which graph is which. <BR> <BR> <BR> <BR> <p>Assume there is no friction acting. If you added the two curves, what would you get? <table cellpadding=8> <tr align=center> <td>a horizontal line<td> a line that decreases as the object travels down the slope <td> a line that increases as the object travels down the slope</tr> </table> <p>If friction was acting on the cart, what would you get if you added the two curves? <table cellpadding=12> <tr align=center> <td>a horizontal line<td> a line that decreases as the object travels down the slope <td> a line that increases as the object travels down the slope</tr> </table> <p>Briefly justify your answer: </body> </HTML>