1) A car moves at a constant speed on a road as shown in figure. The normal force by the road on the car is $(N_A)$ and $(N_B)$, when it is at the points $(A)$ and $(B)$. Then relationship between $(N_A)$ and $(N_B)$ is
1) $(N_A=N_B)$
2) $(N_A>N_B)$
3) $(N_A
4) cannot be predicted
At point A, $$m g-N_A = \frac{m v^2}{r_A} \Rightarrow N_A = m g-\frac{m v^2}{r_A}$$ At point B , $$m g-N_B = \frac{m v^2}{r_B} \Rightarrow N_B = m g-\frac{m v^2}{r_B}$$ $$r_A\frac{1}{r_B} \Rightarrow \frac{m v^2}{r_A}>\frac{m v^2}{r_B} \Rightarrow-\frac{m v^2}{r_A}<-\frac{m v^2}{r_B}$$ $$m g-\frac{m v^2}{r_A}
