Lab Practical
Mary Schaude
5/29
5/29
Procedure
1. Research knots.
2. Tie strings together.
3. Get a force sensor and set up DataStudios.
4. Using the elastic side, tie a hitch at the desired length to the force sensor.
5. Start DataStudios and pull the force sensor back in increments of 5cm.
6. Tie a knot at the desired length and then cut the excess.
7. Record data in Excel.
8. Create a Force vs Position to get k.
9. Try to find an equation.
10. Fail.
11. Try again.
12. Fail.
13. Get a hint from people who got it.
14. Try again.
15. Fail.
16. Cry.
17. Find an error in derivation and try again.
18. Succeed.
2. Tie strings together.
3. Get a force sensor and set up DataStudios.
4. Using the elastic side, tie a hitch at the desired length to the force sensor.
5. Start DataStudios and pull the force sensor back in increments of 5cm.
6. Tie a knot at the desired length and then cut the excess.
7. Record data in Excel.
8. Create a Force vs Position to get k.
9. Try to find an equation.
10. Fail.
11. Try again.
12. Fail.
13. Get a hint from people who got it.
14. Try again.
15. Fail.
16. Cry.
17. Find an error in derivation and try again.
18. Succeed.
The slope of the line in the equation is the spring constant.
Above is the before and after diagram of the drop. The x is the distance from the screw to the drop plate. The length of the static line not including x is ls. The length of the elastic line is le. The mass is labeled m. D is the drop distance. The displacement from the equilibrium is labeled xe.
The equation to find xe is found using PE=EE.
D is the drop distance. It should equal the addition of the static string, the elastic sting, elastic string's displacement, and distance from the screw to the drop plate. It is rearranged to find ls because all other measurements are known.
The equation for xe is substituted in and the equation is solved. Then to find the full length of the static string x and ls are added together.
What Went Wrong?
My drop fell too short. The reason why the drop didn't work was because the force was not proportional to the displacement. At some points it took more force to travel the same distance and at other it took less. The graph makes a slight curve which can throw off the spring constant.