University:
Concordia University Wisconsin
Course:
PHYS 1514 | General Physics I
Academic year:

2022
Views:

280

Pages:

2
Author:

ilikemyicons0y5

Name: Block: Physics Equilibrium Lab Purpose: To calculate the mass of an object using equilibrium methods. Materials:  Clinometer app downloaded to phone  Spring scale  String  Mass (with actual mass written on it) Procedure: 1. Hang a mass from a string on a nail in the classroom 2. Pull the mass horizontally out from the wall using a spring scale. (Hold scale horizontal.)  Draw a diagram of the situation and label the forces and angle involved.  Create a table of θ and resulting Fspring. 3. Repeat procedure #2 for 5 different angles between 10 o and 80o. (Only one drawing though.) 4. Plot a graph of Fspring vs θ. 5. The graph is not linear. Draw an equilibrium triangle and explain why using tan θ, instead of θ, should yield a straight line. Add a tan θ column to your table and plot a graph of Fspring vs tan θ. 6. Calculate the slope of the straight-line graph and determine what physical quantity it represents. 7. Calculate the mass from your experimental results to 3 sig figs. 8. Calculate the percent difference between your measured mass and the actual mass (as recorded on the mass itself): 𝑝𝑒𝑟𝑐𝑒𝑛𝑡 𝑑𝑖𝑓𝑓𝑒𝑟𝑒𝑛𝑐𝑒 = | 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 − 𝑎𝑐𝑡𝑢𝑎𝑙 | × 100% 𝑎𝑐𝑡𝑢𝑎𝑙 Please return all lab equipment to the front of the class once you have completed the lab. Each lab member, individually, will hand in the following:  Lab report with five sections 1. Title, 2. Purpose, 3. Materials, 4. Procedure, Data and Observations, (procedure summarized and insert data and observations into the flow of the procedure) and 5. Analysis/Conclusions. (Own words, not simply a copy of a partner’s lab!)  Work clearly showing values and calculations used to find the mass.  Table showing the 5 measured angles and forces, two graphs, the percent difference between the actual and measured mass.  The write up should be very neat and organized – easy to read and interpret – and be hand written (not typed.) Marking guide:  Lab organized, all required sections (with diagram in procedure)  Discussion of how to get: straight line graph, calculated mass, % difference (can all be included in procedure section)  Two graphs (on graph paper, not sketches)  Analysis and conclusion Total: 5 marks 5 marks 4 marks 6 marks /20 marks Due date: Labs must be handed in on the due date. Labs will not be accepted after they have been marked and returned. (Personal Awareness and Responsibility Core Competency) If a student was away on the day of the lab, he/she can come to make up the lab, before it is handed back, immediately when he/she returns to school. Write-up hints: Analysis and Conclusions:  Did you accomplish the purpose of the lab?  Discuss what your results mean in terms of the physics concept being studied. Connection to formula/theory. What was learned through the lab? Did it prove a physics concept? Explain.  Did the procedure lead to good results? Is there a better way to do the lab?  List any inherent errors that affected the results like a breeze, friction of… , etc (NOT “human error”).

Equilibrium Lab

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