Experiment 2: Newton's Third Law and Force PairsIn this experiment, you will investigate Newton's Third Law of Motion by observing forces exerted on objects.Materials5 N Spring Scale10 N Spring Scale(2) 30 cm Pieces of String 0.5 kg MassPulleyProcedurePart 11. Make sure the spring scales are calibrated using the standard masses. 2. Hook the handle of the 5 N spring scale to the hook of the 10 N spring scale. 3. Holding the 10 N spring scale stationary, pull the hook of the 5 N spring scale until theforce reads 5 N on it. Record the force on the 10 N spring scale in Table 3. 4. Repeat Steps 2 and 3 with the 10 N spring scale hanging from the 5 N spring scale. Record the force on the 5 N spring scale in Table 3.Part 21. Suspend the 0.5 kg mass in the air using the 10 N spring scale. Record the force on the 10 N spring scale in Table 4. 2. Tie one end of one of the pieces of string to the 0.5 kg mass and the other end to the hook of the 10 N spring scale. 3. Suspend the mass in the air by lifting the 10 N spring scale. Record the force on the 10N spring scale in Table 4. © 2014 eScience Labs, LLC.All Rights ReservedTable 3: Force on StationarySpringsForce on Stationary 10 N Spring Scale (N)5.60 NForce on Stationary 5N Spring Scale (N) 5 N 4. Untie the end of the string attached to the 0.5 kgmass and tie it to the hook of the 5 N spring scale. 5. Hook the 0.5 kg mass to the handle of the 5 N springscale. Suspend the mass, scales, and string by holdingthe handle of the 10 N spring scale. Record the valuesof the spring scales in Table 4. 6. Secure the pulley on a table top by tying string to one of the hooks. Then, use masking tape to secure the string to a table top so that the hook on the top of the pulley lays flat on the side of the table top (Figure 5). 7. Using the mass setup from Step 5, place the string over the pulley by unhooking one of the spring scales, feeding the string through the pulley and reattaching the string tothe hook of the spring scale (Figure 6). 8. Hold the 10 N spring scale in place so that the scales and mass are stationary. Record the values for both spring scales in Table 4. © 2014 eScience Labs, LLC.All Rights Reserved Figure 5: Pulley Set UpFigure 6: Step 7 reference(string length and mass mayvary).Table 4: Spring Scale Force DataSuspension Set UpForce (N) on 10 NSpring ScaleForce (N) on 5 NSpring Scale0.5 kg Mass on 10 N Spring Scale4.90 N N/A 0.5 kg Mass with String on 10 N Spring Scale 5 N0.5 kg mass, string and 5 N Spring Scale on 10 Nspring scale 5.60 2.80.5 kg mass, string and 5 N Spring Scale on 10 Nspring scale on Pulley 6 N 5 N © 2014 eScience Labs, LLC.All Rights ReservedPost-Lab Questions1. How did the magnitude of the forces on both spring scales compare after you moved the 10 N spring scale?2. How did the magnitude of the forces on both spring scales compare after you move the 5 N spring scale?3. Use Newton’s 3rd Law to explain your observations in Questions 1 and 2.4. Compare the force on the 10 N spring scale when it was directly attached to the 0.5 kg mass and when there was a string between them.5. Compare the force on the two spring scales in Steps 5 and 6. What can you conclude about the tension in a string?© 2014 eScience Labs, LLC.All Rights
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