In the absence of external torque for a body revolving about any axis, the quantity that remains constant is

Question

In the absence of external torque for a body revolving about any axis, the quantity that remains constant is (A) kinetic energy (B) potential energy (C) linear momentum (D) angular momentum

Tardigrade Admin · Accepted Answer

In the absence of external torque for a body revolving
about any axis, the angular momentum remains constant. This
is known as law of conservation of angular momentum.

τ = \frac{d L}{d t}

As τ = 0 ∴ \frac{d L}{d t} = 0 or L =

constant

Q. In the absence of external torque for a body revolving about any axis, the quantity that remains constant is

kinetic energy

potential energy

linear momentum

angular momentum

In the absence of external torque for a body revolving about any axis, the angular momentum remains constant. This is known as law of conservation of angular momentum. τ=dtdL​ As τ=0∴dtdL​=0 or L= constant

In the absence of external torque for a body revolving
about any axis, the angular momentum remains constant. This
is known as law of conservation of angular momentum.
$τ = \frac{d L}{d t}$
$As τ = 0 ∴ \frac{d L}{d t} = 0 or L =$ constant