Modul of Experiment Date Lecturer Study Program Semester/ Year Time
: : Epri Pratiwi / Maralo Sinaga : Life Science / Engineering Faculty : :
Subject:
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MEC-02-02. Static effect of forces : Bending of a Leaf Spring ont:
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PO Box 150, BSD CPA 15330 Tel. +62 21 50588000 +62 85212318000
[email protected]; www.iuli.ac.id
IULI – Eco Campus, The Breeze Jl. BSD Grand Boulevard BSD City 15345 Island of Java
Modul of Experiment MEC-02-01. Static effect of forces: Bending of a Leaf Spring I.
Objective Investigate the behavior of a leaf spring under load, make a graph of the measuring results and determine the spring constant D.
II. Theoretical Introduction Principles Forces are recognized by their effects. For example, static forces can deform a body. If the force is not too strong, the deformation turns out to be proportional to the force acting on the body. In the experiment, it is shown that the expansion s (i.e. the change of length, see Fig. 1) of a helical spring is directly proportional to the force F. Hooke’s law applies: 𝐹 = 𝐷. 𝑠 ............................................................................................................................. (I) D: spring constant This experiment examines the bending of a leaf spring arrested at one end in response to a known force generated by hanging weights from the free end. Here too, the deflection is proportional to the force acting on the leaf spring. III. Methodology Apparatus Leaf Spring 1 set of 6 weights, each 50 g 2 stand bases MF 2 stand rods, 50 cm, ∅ 10 mm 1 stand rod, 25 cm, ∅ 10 mm 1 Universal bosshead 1 Steel tape measure, 2 m 1 pair of pointers 1 plug-in axle 1 Metal Plates, set of 5 1 Fishing Line
Setup The experimental setup is illustrated in Fig. 1.
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PO Box 150, BSD CPA 15330 Tel. +62 21 50588000 +62 85212318000
[email protected]; www.iuli.ac.id
IULI – Eco Campus, The Breeze Jl. BSD Grand Boulevard BSD City 15345 Island of Java
Modul of Experiment
Fig. 1 Experimental setup for measuring bending of a leaf spring
IV. Measurement Data Input Table Table 1: Spring length L as a function of the number n of weights suspended 𝑛
𝐿 𝑐𝑚
0 1 2 3 4 5 6 Table 2: changes of length (s) and forces acting on the springs File:
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QT.0.02/Rev.04
PO Box 150, BSD CPA 15330 Tel. +62 21 50588000 +62 85212318000
[email protected]; www.iuli.ac.id
IULI – Eco Campus, The Breeze Jl. BSD Grand Boulevard BSD City 15345 Island of Java
Modul of Experiment 𝑛
𝐹 𝑁
𝑠 𝑐𝑚 ∅ = 15 𝑚𝑚
1 2 3 4 5 6 Calculation of Spring Constant : ……
Graph of Result : ….
Fig. 2 Graph of Relation between the change of length s and the force F acting (circles: ∅ = 15 mm, squares: ∅= 20 mm) V. Reference Physics Leaflet LD Didactic, Title: Bending of a leaf spring. File:
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QT.0.02/Rev.04
PO Box 150, BSD CPA 15330 Tel. +62 21 50588000 +62 85212318000
[email protected]; www.iuli.ac.id
IULI – Eco Campus, The Breeze Jl. BSD Grand Boulevard BSD City 15345 Island of Java
