1. A child is given a wagon for her birthday. She refuses to use it because "The law of reciprocity says that no matter how hard I pull the wagon will exert an equal but opposite force on me, so I will never be able to get it to move forward." (a) What is the fundamental problem with the child's argument? (b)Draw a camera shot of the situation. Draw a corresponding FBD for the girl and explain what each force in it is, including the type of force (tension, normal, gravitational, static friction, kinetic friction, electric, magnetic,) and the object exerting it (by what?) and what is exerted on (on what?). Also, give a motion diagram for the girl and explain how the sum of the forces in your FBD for the girl matches what is needed for her motion diagram. 

2) A massless string is attached to one or more identical blocks at rest. Rank the tension on the strings at the labeled points. Explain, including stating any assumptions. 

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