# UMass Amherst PHYSICS 131 - Physics Lab 131 Report 2 (5 pages)

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# Physics Lab 131 Report 2

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## Physics Lab 131 Report 2

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Pages:
5
School:
University of Massachusetts Amherst
Course:
Physics 131 - Intro Physics I
##### Intro Physics I Documents

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Forces and Newton s Second Law Experiment Physics 131 Section L Thursdays 9 00 AM ILC S110 Abstract This experiment looked at employing Newton s Second Law which states an object s acceleration is produced by a net force proportional to the magnitude of the object in the same direction and inversely proportional to the mass We proved that balancing forces will cancel out each other s vectors and lead to a balance and an acceleration will only occur as one force is at a greater magnitude than the others Questions Answers 1 Use your analysis from the force table Show mathematically that the sum of the vectors is zero 2 points Table 1 shows our vector values obtained during the experiment Adding each of the vectors entails adding their X components since the string is pulling on the ring in a horizontal direction the x component shows the directionality of each vector By looking at the table the X component of A B and C are 04 01 and 5 respectively as seen in Table 1 if you added these three components it equals 0 2 Calculate the tension T in the string in both cases i e when m 20g and m 40g T M a Here M is the mass of the PAScar and a is the acceleration when m 20g and 40g 2 points Table 2 shows the values obtained at the different masses M 170g a m m M g Table 2 shows the value we obtained for each m 20g T 170 712 121 04 N m 40 g T 170 1 318 224 06N 3 For both the 1st and 2nd labs we had objects that were falling a golf ball for lab 1 and the hanging mass for lab 2 Was the acceleration of both objects constant An object in free fall has constant acceleration Were the two objects golf ball and hanging mass in free fall Explain why or why not 2 points In both experiments the acceleration of both objects was constant Gravity is the only force acting on both making them go towards the earth bounce back up and so on until they reach a stop In both cases it was the only force which fits both as being in the definition of free fall 4 For the force table is the ring in the

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