Lab Work - Phys

PHYS 304/314 LAB: Simple pendulum

Student name: ………………………………… ID: …………………………………… Objectives:

1. To verify the formula T =

2

𝜋

√

𝐿

𝑔

2. To determine the gravitational acceleration by using a simple pendulum.

Part 1:

1. Select a suitable initial length and mass for the pendulum (for which the pendulum does not swing too fast or too slow) for example 30 cm and 1.0 kg.

2. Start by displacing the pendulum through a small angle (less than 10o) then release it.

3. Complete the table below.

Ttheory	= __________(s)
Texperiment	= ________________(s)

Tth−Texp

% error = || x 100 =___________________

Tth

Comments:

Part 2 : Determining the acceleration due to gravity (gexpt) by using the simple pendulum

1. Choose a single pendulum with a mass of 1.0 kg.

2. Select a Non friction and the earth gravity.

3. Start with a 30cm length of the pendulum then pull it slightly with a small angle then release it.

4. Record the periodic time.

5. Change the length to 40cm and record T.

6. Repeat step 5 with another lengths; 50, 60, 70cm, ……

7. Record the data in the following table.

L	0.30 m	0.40 m	0.50 m	0.60 m	0.70 m	0.80 m
T
T2

Plot the graph (T2 vs L) using a graph paper or Microsoft Excel and find the slope.

Substitute value of the slope from above in the following equation

4𝜋2

𝑔𝑒𝑥𝑝 = 𝑠𝑙𝑜𝑝𝑒 = ___________________

Calculate the % 𝑒𝑟𝑟𝑜𝑟 = |𝑔𝑡ℎ−𝑔𝑒𝑥𝑝| 𝑥100 = ___________________________

𝑔𝑡ℎ

Conclusion(s):