lab 8
.pdf
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School
Dallas County Community College *
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Course
1402
Subject
Mechanical_engineering
Date
Jun 22, 2024
Type
Pages
4
Uploaded by MasterPantherPerson1165
1 Torque Name: ________________________ Objectives: •
Describe the factors that determine whether two objects will balance each other •
Predict how changing the position of a mass on the balance will affect the motion of the balance •
Use a balance to the find the masses of unknown objects 1.
Open the PhET Simulation Balancing Act
https://phet.colorado.edu/sims/html/balancing-
act/latest/balancing-act_en.html 2.
Choose “Intro” tab. Play around with the simulation for a few minutes to understand/ explore the functionalities of the different components. 3.
To check if the wooden board is balanced, remove supports under the board by toggling the switch at bottom of the screen to right. Case-1: Place 5 kg fire extinguisher at 2 m mark to the left of the pivot. Where should you place the 10 kg trash can to balance the board? Show your calculations. Case-2: Consider this situation without
using the simulation:
2 1.
Predict what will happen when the supports are removed and explain your reasoning. Once the supports are taken away, the pivot will achieve equilibrium. This is because, although there is a mass discrepancy, the individual with less weight is situated further from the center, while the person with greater mass is closer to the center. The distance of each individual from the pivot point determines the balance. 2.
Predict what will happen if the 80 kg adult was further from the pivot (more right) and explain your reasoning. Should the adult be positioned closer to the right, the equilibrium would be disturbed, resulting in the adult moving closer to the ground while the girl would be raised into the air. 3.
Predict what will happen if the 30 kg child was closer to the pivot (more right) and explain your reasoning. Even if the girl shifts closer to the pivot, the balance remains unchanged; it remains unbalanced. 4.
Test your predictions in the Balance Lab. Make notes about any ideas you have that need to be changed. 5.
What are some rules you could use to make predictions for other situations where masses are on a balance? When conducting experiments, it's crucial to accurately measure both mass and distance to minimize uncertainties in the measurements. Inaccuracies in measurements can sometimes result in incorrect conclusions or results. 6.
Test your rules with some situations in the lab. Make corrections if needed, then show evidence that your rules work. Finding unknown masses Choose “Balance Lab” tab. Select the following options in right corner of the screen: Mass Labels, Level, Rulers In the “Bricks” section on the right of the screen, click on the right arrow. Keep on clicking to the right until you see “Mystery Objects”. Find out the mass of each of the Mystery Objects “E”, “F”, and “G” by balancing each of these against the bricks of known masses. For each Mystery Object, paste a screenshot of balanced seesaw and show all calculation steps.
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