what is deforming force & restoring force?

@Ruhi,

You can refer to the answer posted by your friend, thanks.

Also...

Deforming force can also be termed as the force which displaces a body from its original position or configuration by either changing its location or its shape. 

Restoring force tends to move the place the body back to its original position or configuration. 

 

@Vineet, Good answer, keep it up!
 

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 Deforming force : The external force acting on a body on account of which its size or shape or both change is

defined as the deforming force.
 
2. Restoring force : The force which restores the size and shape of the body when deformation forces are
removed is called restoring force. Deforming force and restoring force are not action reaction pair. Restoring
force opposes the change in the size and shape of a body
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