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Question Bank in Class XI Physics – Mechanical Properties of Solids

Important Points to remember:

  • Deforming forces are external force applied on a body to change its size or shape.
  • Restoring force is the internal force developed in a body trying to bring it back to the original configuration when it is acted upon by an external force trying to change its size or shape.
  • Elasticity is the property of a body by virtue of which it tries to regain its original configuration when the deforming forces are removed.
  • Perfectly elastic body is a body which regains its original configuration completely on removal of deforming forces.
  • Plasticity is the property of a body by virtue of which it does not regain its original configuration on removal of deforming forces.
  • Perfectly plastic body is a body which does not show any tendency to regain its original configuration on removal of deforming forces
  • Stress: The restoring force developed per unit area of a deformed body is called stress.
  • Tensile stress: If a deforming force is trying to produce an increase in length, then the restoring force developed per unit area of cross section is called tensile stress
  • Compressive Stress: When a deforming force acting normal to a surface tries to produce a change in volume, then the restoring force produced per unit area is called compressive stress.
  • Shearing stress: When a tangential force tries to change the shape of a body whose bottom is fixed, then the restoring force developed per unit area is called Shearing stress.
  • Strain: The ratio of the change in dimension to the original dimension of a deformed body is called strain
  • Linear or longitudinal strain

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