Answers Key for Exam 1 - General Physics I | Phys 213, Exams of Physics

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Physics 213H Test 1 Section 1: Dr. Gladden, Sept. 29, 2009 NAME: EY UM ID#: Conceptual Questions (5 points each) Answer each of the following questions drawing on and referencing the physical concepts we have cavered. Sketches may aid your discussion and no more than 2 - 4 sentences should be required. Vv Describe the motion of a car (as in acceleration and veloc- 1. ity) which follows the velocity - time graph shown below in the various parts indicated. Qi+ Constant Btceberatra. aad) 1 4g Uveamly 1 OPCES ¢ eg bith Flere > Statted Shon, b— « accetlerte. 6 O CSbape is ©) C wy ACE berert (eo, ns Pega tive — iF has Slowed fo wr at Vly Pere, Here MM ff changing fhe Mee S 2. A block of mass M with a string attached rests on a perfectly frictionless surface. A student pulls gently on the string and the block accelerates according to F = ma. The student repeats the experiment, but now yanks hard on the string and the string breaks. Usc Newton's Laws to explain why this happens. The hope Can. tate Macttta., PeuSin ¢ £ T., — = Ts. i = ha 0 , the TF ath bnew k, be "Ya bing Y oe one ty ny toa GCC he trat¥e by “hee estes tar qr Haas i 1 Ip h COME «