tutorial4_sp10a

tutorial4_sp10a - 1 of 4 Physics 2010 Spring 2010...

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1 Physics 2010 – Spring 2010 Recitation Assignment 4 NAME ________________________ Section Day (circle): M Tu W Th F Time: 8a 10a 12p 2p 4p TA Name:____________________ Instructions : Work in groups of 3 to 4 . Use the space provided for your answers. This week's assignment will focus on circular motion and gravity. (Ch. 5) 1. Fig.1, shows a circular horizontal frictionless track lying flat on a table. This is a top view. A marble of mass m is shot into the track at point A with speed v A . The marble emerges at point B. The radius of the track is r . a. What are the forces on the marble at point C? What is the magnitude and direction of the net force on the marble? b. Sketch the marble's trajectory after it exits the track at point B. 2. Now, consider same track (Figure 2), but this time the track is held vertically. Point A is at the top and C is at the bottom. A marble of mass m again is shot into the track at point A with initial velocity v A . The radius of the track is r and there is no friction. a. What are the forces on the marble at the bottom of the track (point C)? What is the magnitude and direction of the net force? How do you know the net force is not zero? b.
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tutorial4_sp10a - 1 of 4 Physics 2010 Spring 2010...

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