137) A body of weight 100 N falls freely through a distance of 10 m against an atmospheric drag force of 5 N. considering the body as the system, the work interaction is
50 Nm
Related OFB Chargeman Mechanical Question Paper - 2014 with Answer Key
All of these
During cold working process
* Grain structure is distorted
* Strength and hardness of metal increases
* Surface finish is improved
Resilience
Resilience:
Resilience is the ability of a metal to absorb energy and resist soft and impact load.
Toughness:
When a huge external force is applied on a metal, the metal will experience fracture. Toughness is the ability of a metal to resist fracture. The ability of a material to resist fracture due to high impact loads, is called toughness.
Stiffness:
When an external force is applied on a metal, it develops an internal resistance. The internal resistance developed per unit area is called stress. Stiffness is the ability of a metal to resist deformation under stress.
Hardness:
Hardness is the ability of a metal to resist permanent change of shape caused by an external force.
Cold heading
The process extensively used for making bolts and nuts is cold heading.