Changing Shape
Section: Deformation of Solids | Syllabus: Cambridge AS Level Physics (9702)
6.1 Changing Shape
When two or more forces are applied to an object it can deform (change shape). The direction of the applied forces determine whether the object will extend (get longer) or compress (get shorter).
Figure 6.1: Tensile and Compressive Forces
(Diagram showing (a) Tensile forces acting outwards causing material to be in tension, and (b) Compressive forces acting inwards causing material to be in compression.)
Types of Forces
- Tensile Forces: Cause an object to stretch or increase in length. Examples: suspension bridge cables, bunny jump rope.
- Compressive Forces: Cause an object to be squashed and decrease in volume or length. Examples: vehicle suspension springs compressing under weight.
Tensile forces tend to cause an object to lengthen, and compressive forces tend to cause an object to shorten.
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