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Deformation of Solids 💗  Solid is characterized by very packed particles and they are not free to move around within the substance. A solid can change its shape when pressure is applied to it. The forces applied to the solids will amend the position of the solid particles and its spacings. This will then changes the external structure or shape and size of the solid, which defines deformation of solids.   Stress  is the measure of the force required to cause solid deformation. A   strain  is the measure of the degree of deformation.  The strain is given as a fractional change in either the length, geometry or volume. It is a dimensionless number.  The greater the stress , the greater the strain . The proportionality constant in this relation is known as the   Young's modulus,Y  .                                    ...

If we place a coin on top of a book, then we pull the book quickly, the coin will stay at the same position, isn't it? While travelling on a moving bus, we will experience a forward movement when the bus suddenly stop. These are typical examples that always been used by teachers at school in order to explain the concept of inertia.  But many students still do not understand how to relate inertia with mass.  Moreover, there is no proper experiment for inertia included in The Physics SPM curriculum. I found that most teachers just tell and ask students to just imagine the effect of inertia instead of showing them the real effect. Hence, I decided to design and develop an experimental inertia kit s shown in Figure 1.  Figure 1: Inertia Kit An innovative teaching material is required in order to visualize the concept of inertia among students and to improve their understanding. We build an Inertia Kit that is affordable and portable. Our innovation of Inertia Kit is...