A student attempts to pull himself up by tugging on his hair. He will not succeed
As the force exerted is small
The frictional force while gripping, is small.
Newton's law of inertia is not applicable to living beings.
As the force applied is internal to the system.
A student attempts to pull himself up by tugging on his hair. He will not succeed
As by an internal force momentum of the system can not be changed.