PHYS 1401 PhET Simulation Balancing Act
Order ID:89JHGSJE83839 Style:APA/MLA/Harvard/Chicago Pages:5-10 Instructions:
PHYS 1401 PhET Simulation Balancing Act
PHYS 1401 Lab-5: 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
Torque
Torque is the twisting effect caused by one or more forces. Torque is a twisting action that produces rotational motion or a change in rotational motion. To understand torque (rhymes with dork), hold the end of a meterstick horizontally with your hand. If you dangle a weight from the meterstick near your hand, you can feel the meterstick twist. Now if you slide the weight farther from your hand, the twist you feel is greater, although the weight is the same. The force acting on your hand is the same.
Lever arm is the distance between the point of application of the force and the axis of rotation. It is the shortest distance between the applied force and the rotational axis. We are intuitively familiar with torques while playing on a seesaw. Kids can balance a seesaw even when their weights are unequal. Weight alone doesn’t produce rotation. Torque does, and children soon learn that the distance they sit from the pivot point is every bit as important as weight.
Torque is calculated using the equation:
We are hanging mass on the meter stick. Force is the weight of the object. Lever arm is the distance between the fulcrum and point where mass is hanged. When the torques are equal, making the net torque zero, no rotation is produced. The meter stick will be in equilibrium. Mathematically,
Procedure
- Open the PhET Simulation Balancing Act https://phet.colorado.edu/sims/html/balancing-act/latest/balancing-act_en.html
- Choose “Balance lab” tab. Play around with the simulation for a few minutes to understand/ explore the functionalities of the different components.
- Select the following options in right corner of the screen: Mass Labels, Level, Rulers
- 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:
Consider this situation without using the simulation:
- Predict what will happen when the supports are removed and explain your reasoning.
- Predict what will happen if the 80 kg adult was further from the pivot (more right) and explain your reasoning.
- Predict what will happen if the 20 kg child was closer to the pivot (more right) and explain your reasoning.
- Test your predictions in the Balance Lab. Make notes about any ideas you have that need to be changed.
- What are some rules you could use to make predictions for other situations where masses are on a balance?
Case-2:
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.
(We can cancel “g” as g is present in each term of the equation)
Masses m1 and m2 are given; r1 = 2 m; unknown r2 =?
Case-3:
Place 5 kg brick and 10 kg brick to the right of the pivot, and 15 kg to the left of the pivot. Where should you place these bricks to balance the board? Show your calculations.
(We can cancel “g” as g is present in each term of the equation)
Solve for r3. Given: m1 = 10 kg, m2 = 5 kg, m3 =15 kg
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.
Mystery Object “E”
Screenshot of balanced seesaw: Calculations:
Mystery Object “F”
Screenshot of balanced seesaw: Calculations:
Mystery Object “G”
Screenshot of balanced seesaw: Calculations
RUBRIC
Excellent Quality
95-100%
Introduction 45-41 points
The background and significance of the problem and a clear statement of the research purpose is provided. The search history is mentioned.
Literature Support
91-84 points
The background and significance of the problem and a clear statement of the research purpose is provided. The search history is mentioned.
Methodology
58-53 points
Content is well-organized with headings for each slide and bulleted lists to group related material as needed. Use of font, color, graphics, effects, etc. to enhance readability and presentation content is excellent. Length requirements of 10 slides/pages or less is met.
Average Score
50-85%
40-38 points
More depth/detail for the background and significance is needed, or the research detail is not clear. No search history information is provided.
83-76 points
Review of relevant theoretical literature is evident, but there is little integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are included. Summary of information presented is included. Conclusion may not contain a biblical integration.
52-49 points
Content is somewhat organized, but no structure is apparent. The use of font, color, graphics, effects, etc. is occasionally detracting to the presentation content. Length requirements may not be met.
Poor Quality
0-45%
37-1 points
The background and/or significance are missing. No search history information is provided.
75-1 points
Review of relevant theoretical literature is evident, but there is no integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are not included in the summary of information presented. Conclusion does not contain a biblical integration.
48-1 points
There is no clear or logical organizational structure. No logical sequence is apparent. The use of font, color, graphics, effects etc. is often detracting to the presentation content. Length requirements may not be met
You Can Also Place the Order at www.collegepaper.us/orders/ordernow or www.crucialessay.com/orders/ordernow Simulation Balancing Act