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HOOKE’S LAW
1. Objectives
The main objective of this experiment is to show Hooke’s Law of spring, calculate the total energy absorbing in the spring.
2. Equipment
Tripod Base Barrel Base Support Rod, square, l=1000mm Right Angle Clamp Cursor, 1 pair Weight Holder f. Slotted Weights Slotted Weight, 10g, black Slotted Weight, 10g, silver bronze Slotted Weight, 50g, black Slotted Weight, 50g, silver bronze Helical Spring 3 N/m Helical Spring 20 N/m Silk Thread, 200m Meter Scale demo l=1000mm Holding Pin Square section rubber strip, l 10m
HOOKE’S LAW
Figure 4.1 Experimental set up
HOOKE’S LAW
- Set up the spring as figure 4. 2.Measure the length of each spring Lthin =……………. Lthick =……………….
- Hang a 𝑚 1 on first spring and record the elongation.
- Repeat the step 3 for different masses.(𝑚 2 , 𝑚 3 )
- Repeat the steps 4 and 5 for second spring.
- Calculate the applied force for different masses and spring.
- Calculate 𝑘 using 𝐹𝑖 ⁄ ∆𝐿 (^) 𝑖and 𝑘𝑎𝑣𝑔 for each spring.
For thin spring: 𝑘𝑎𝑣𝑔 = … … ... For thick spring: 𝑘𝑎𝑣𝑔 = … … ..
Spring Mass(kg) Length of the spring(m)
Elongation (m)
Force (m * g)
k = 𝐹𝑖 ⁄ ∆𝐿𝑖 (kg*g / m) k^ av Thin 0, Thin 0, Thin 0, Thick 0, Thick 0. Thick 0.
- Connect the thin and thick springs in series.
- Measure the extension ∆𝐿 =………….. caused by a 0.12 kg mass compute the equivalent value of
𝑘𝑒𝑞 from 𝑘𝑒𝑞 = (^) ∆𝐿𝐹
……………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………
By means of the formula (^) 𝑘^1 𝑒𝑞 = (^) 𝑘^11 + (^) 𝑘^12 or 𝑘𝑒𝑞 = (^) 𝑘𝑘 11 +𝑘^ 𝑘^22
……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………
HOOKE’S LAW
- Connect the first and second springs in paralel. Measure the extension ∆𝐿 =………….. caused by a 0.17 kg mass compute the equivalent value of
𝑘𝑒𝑞 from 𝑘𝑒𝑞 = (^) ∆𝐿𝐹
……………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… By means of the formula 𝑘𝑒𝑞 = 𝑘 1 + 𝑘 2 ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………
