Question

A particle moves along a circular path with decreasing speed.Then

• A. its angular momentum remains constant
• B. its resultant acceleration is towards the centre
• C. particle moves in a spiral path with decreasing radius
• D. the direction of angular momentum remains constant

Answer 1

The correct option is D the direction of angular momentum remains constant

A particle moves along a circular path with speed, then the angular momentum is given by

$\overrightarrow{L}=\overrightarrow{r}\times \overrightarrow{p}=\overrightarrow{r}\times m\overrightarrow{v}$

When the speed $v$ decrease, the magnitude of of angular momentum decreases. But the direction of angular momentum remains constant.

The correct option is D.