JEE · Physics · Mechanical Properties of Solids doubts
8 doubts found
Two wires of the same material carry the same load. How can I tell which stretches more?
Start from Delta L = FL/(AY).
What does “Stress and strain” actually mean in Mechanical Properties of Solids, and why does it matter for JEE?
Stress measures internal restoring force per area; strain measures fractional deformation. Stress has pressure units, while strain is dimensionless.
I keep getting “Stress and strain” questions wrong in Mechanical Properties of Solids. What's the trap?
giving strain the unit metre.
What does “Hooke's law and elastic limit” actually mean in Mechanical Properties of Solids, and why does it matter for JEE?
For small deformation within the proportional limit, stress is proportional to strain. Beyond that range the graph need not remain linear, and beyond the elastic limit the body may not recover fully.
I keep getting “Hooke's law and elastic limit” questions wrong in Mechanical Properties of Solids. What's the trap?
using Hooke's law up to fracture.
What does “Young, bulk and shear moduli” actually mean in Mechanical Properties of Solids, and why does it matter for JEE?
Young's modulus resists length change, bulk modulus resists volume change, and shear modulus resists shape change. A larger modulus means less strain for the same corresponding stress.
I keep getting “Young, bulk and shear moduli” questions wrong in Mechanical Properties of Solids. What's the trap?
saying a larger modulus means the material deforms more easily.
What does “Elastic energy” actually mean in Mechanical Properties of Solids, and why does it matter for JEE?
Work done while gradually stretching an elastic body is stored as elastic potential energy. In the linear region, energy density is one-half stress times strain, the triangular area under the stress-strain graph.