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Zero work is defined when force and displacement are perpendicular to one another and when force or displacement is zero. Example: The force acts in a downward direction, ... If you push a wall, it doesn't move there's no work done.
The work done by Gravitational force when we climb on a tree.
the work done by frictional force of air when a ball is falling downwards.
a rigid body is a solid body in which deformation is zero or so small it can be neglected
Inertia of linear motion is defined as the tendency of an object to remain in a state of rest or of a constant linear velocity. Greater the inertia, more force is required to change this state.
The mass is equal to the linear inertia of an object.
Its SI unit is kg.metre
2
Its dimension is L 2m1t0
No it's not necessary that the centre of mass of a body should lie inside the body. Consider a circular ring, its centre of mass lies at the center of the ring where there is no content of the body. So it can also lie outside the body
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