Embibe Experts Solutions for Chapter: Rotational Mechanics, Exercise 10: Exercise (Assertion & Reason)

Assertion: To unscrew a rusted nut, we need a pipe wrench with longer arm.

Reason :Wrench with longer arm reduces the required force applied on the arm

Assertion: A rotating body can be in stable and unstable equilibrium.
Reason: Moment of inertia is always different for the different axis of rotation.

Assertion: Practically a body rolling on a surface will lose its complete $KE$. 
Reason: Friction will convert its $KE$ into $PE$ of atoms.

Assertion: Spin angular momentum is an intrinsic property of the body.
Reason: It doesn’t depend on the coordinates of the body.

Assertion : Angular momentum of a satellite remains conserved.
Reason : Conservation of linear momentum leads to conservation of angular momentum.

Assertion : If a unit north pole rotates around a current carrying wire then work has to be done.
Reason : Magnetic field produced by current is always non-conservative in nature. 

Assertion: Torque on a body can be zero even if there is a net force on it. 
Reason: Torque and force on a body are always perpendicular.

Assertion: Torque on a body may be non-zero even if the net force acting on it is zero.
Reason: Force does not depend on point of application, but torque depends on point of application.