HOOKE'S LAW
LOAD · EXTENSION · ELASTIC LIMIT
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Stretch a Spring
0
2
4
6
8
10
12
cm
load F (N)
extension x (cm)
1
2
3
4
5
6
elastic limit
F
=
load
x
=
extension
k
=
spring constant
1. Hooke's Law
F = k x
Up to the elastic limit, extension is
directly proportional to the load
k = F / x =
2. Elastic Limit
Before the limit: remove the load → spring returns
Beyond the limit: graph not straight, spring damaged
3. Remember
Load double → extension double
Unit of k: N m⁻¹ (newton per metre)
MATRIC PHYSICS · PROPERTIES OF MATTER · PUNJAB BOARDS
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