Conical Pendulum Lab – Flying Pigs! Unit 5 – Rotational Motion Introduction A conical pendulum is a device that goes through repeated motion (pendulum) but traces out a cone in the process. The flying pig toys used in this lab exhibit this type of motion, as shown in figure 1 below.
Using only a meterstick, you will be tasked with determining the period of the conical pendulum. Additionally, we will work on how to determine the tangential and angular velocities of the flying pig as it travels through its circular path. Theoretical Background A free-body diagram for the flying pig is shown in Figure 2 above. Note – there is no centripetal force drawn in the FBD; only tension and the force of gravity. The centripetal force acting on the pig during the circular motion is the horizontal (IN) component of the tension. Also, the vertical component is equal to the force of gravity. Finally, we can define the tangential velocity (vt) of the pig in terms of the circumference of the circular path and the period (time for one revolution) of the motion, as shown below. Analysis of the forces acting on the pig yield:
from component triangle for tension: nd
2 Law and substitution yields:
combining equations above yields:
𝐶 𝑣" = 𝑇 𝐹'() = 𝐹' sin 𝜃 𝐹'. = 𝐹' cos 𝜃
46
= 𝑚𝑎3 = 𝑚 5 7 𝐹' cos 𝜃 = 𝑚𝑔
𝐹' sin 𝜃
tan 𝜃
=
456
<7
T = … (the Pre-Lab Assignment!) Solve for the period (T) in terms of quantities measureable with only a meterstick.
final substitution yields:
Procedure, Data, Analysis, and Conclusion Use the meterstick to make any measurements you deem necessary to determine the required unknowns: period (T), tangential velocity (vt), and angular velocity (ω). Show your detailed calculations (including theoretical algebraic manipulations) and include necessary explanations. Finally, use your data for all four flying pigs to create graphs of period vs. length, speed vs. length, and angle vs. length in order to make conclusions about the properties of a conical pendulum. Include any relevant information that you learned from the lab in order to explain your understanding. Finally, include an analysis of the percent error between your measured values for the period of each pendulum and the measured values from Mr. Patterson (using a stopwatch).
Using only a meterstick, you will be tasked with determining the period of the conical pendulum. Additionally, we will work on how to determine the tangential and angular velocities of the flying pig as it travels through its circular path. Theoretical Background. A free-body diagram for the flying pig is shown in Figure 2 above.
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