Lab Phys1111 - Freebody Weight Normal

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School

Georgia State University *

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4520

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Mechanical Engineering

Date

Dec 6, 2023

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pdf

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6

Uploaded by ElderJayMaster324

Phys1111K: Free-body diagrams, Weight, and Normal force Name: Group Members: Date: TA’s Name: Learning Objectives: I. Learn to identify forces acting on objects and apply Newton’s third law to identify action- reaction pairs. II. Understand the difference between normal force and weight. Apparatus: block, flat weighing scale, 500 g hanging weight, spring scales Part A: Forces between two spring scales 1. Take two identical, spring scales and attach the hooks together. Call one of them scale 1 and the other scale 2. Now have two people each pulling on one of them. Don’t pull so hard as to max out the scale. What is applying the force that results in the reading on scale 1? 2. What is applying the force that results in the reading on scale 2? 3. Now pull so that one of the scales reads about three times more than the other scale. What did you need to do to accomplish this task? 4. Explain what you can conclude from the experiment above.
Part B: Forces between a block and a scale 5. Place weighing scale on the table. Place a small black block on the weighing scale. Record the scale reading. __________________ 6. When you did this were you recording the mass or the weight of the block? 7. Determine the weight of the small black block including units. Show any calculations you perform. 8. Identify the forces acting on the block. 9. Is the block in equilibrium? How do you know? 10. Identify the forces acting on the scale. 11. Is the scale in equilibrium? How do you know?
12. First draw a free body diagram for the block. Here you consider the block as your system of interest. Everything else is external. Then draw a free body diagram for the scale. Here you consider the scale as your system of interest. Everything else is external. Remember that the length of force vectors is proportional to magnitude. Label each force vector appropriately! Free body diagram for block Free body diagram for scale 13. Identify all the action-reaction pairs in the two free-body diagrams. To do this connect the forces with a dotted line: F A on B F B on A Ex: 14. Remember that the two forces that comprise an action-reaction pair act on different objects. Do you need to revise your answer to question 13? 15. Are there forces acting on the block and scale, which are not part of one of the action-reaction pairs you identified, that is, are there any forces without a dotted line? If so, list them below. Forces on Block Forces on Scale 16. For the forces you identified in Question 15, do each of these actions have a reaction force? If so, why are they not on our diagrams?
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