# Physics 2 Pendulum Lab Report Pre Lab Questions

Anonymous

### Question Description

experiment 2: Pendulum

I need answers for the attached pre lab questions, experiment questions, graphs and diagrams.

pendulum_1.jpg
pendulum_2.jpg
pendulum_3.jpg
pendulum_4.jpg
pendulum_pre_lab.jpg

### Unformatted Attachment Preview

Geontiry
School: University of Maryland

Hello buddy! I have attached the answer in a word document for you. :) Let me know if you have any edits or have any questions.

Last Name 1

Name
Instructor's name
Course
Date
Physics 2: Pendulum Lab Report
Pre-lab Questions
Free body diagram of a pendulum while in motion is shown in the diagram below:

For a pendulum at equilibrium we have tension in the string given by:
𝑇𝑠 = 𝑚𝑔 = 0.15 𝑥9.8 = 1.47 𝑁
When you cut the string into half, the period will be shorter. This is because when you cut
the string by half, you reduce the length (L) by half. From the equation for getting the
period, the period is directly proportional to length as given below:

𝑇 = 2𝜋√

𝐿
2𝜋
= ( ) √𝐿 = 𝑘√𝐿 𝑤ℎ𝑒𝑟𝑒 𝑘 = 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡
𝑔
√𝑔
𝑜𝑟 𝑇 ∝ √𝐿

Last Name 2

And so, decreasing the length by half, decreases the period by half.
When you double the attached mass, the period will not change. This is because the period
does not depend on the mass attached to the pendulum but it only depends on the length
(L) of the string and the value of the gravitational field strength (g) according to the
following equation.

𝑇 = 2𝜋√

𝐿
2𝜋
= ( ) √𝐿 = 𝑘√𝐿 𝑤ℎ𝑒𝑟𝑒 𝑘 = 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡
𝑔
√𝑔
𝑜𝑟 𝑇 ∝ √𝐿

And so, doubling the attached mass, does not change...

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