Question

What happens to power when force is perpendicular to velocity?

Answer 1

Step 1: Given

Force = F

velocity= V

Angle = ${90}^o$

Step 2: Formula

$P=\stackrel{\rightharpoonup }{F}.\stackrel{\rightharpoonup }{V}wherePispower$

Step 3: Calculation

We know that power is dot product of force and velocity.

$$\begin{gathered} P=F.V\cos \theta \\ =FV\cos 90 \\ =0(\cos 90=0) \end{gathered}$$

Hence, Power would be zero.