The unit of stress is:

What is stress? Give its two definitions.

Two equal and opposite forces are exerted on a bar (rod) as shown in the figure. The plane $PQ$ makes an angle $\theta$ with the cross-section $PR$ (having area $a$). Find the tensile stress on the plane $PQ$.

Write copper,steel,glass,and rubber in the order of increasing coefficient of elasticity.

Why is rubber used to make cycle seats instead of wood or iron?

$A$ force of $10 \,N$ is required to break a wire of radius $1 \,mm$. The force required to break the wire of the same material, but radius $3 \,mm$ will be