Question

the extension-load graph for a spring is shown. the unstretched length of the spring is 17.0 cm. when an object is hung from the spring, the length of the spring is 19.2. what is the weight of the object?

Answer 1

Using Hooke's law: F=kx

k=

x

F

=

slope of graph

1

Line passes from : (1,0.4),(2,0.8)

slope =

2−1

0.8−0.4

=0.4

k=

0.4

1

=2.5

Extension = Final length − initial length

x=16.4−15=1.4

using F=kx

F=2.5×1.4

F=3.5N

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