Question

A circular road of radius r is banked for a speed v = 40 km/hr. A car of mass m attempts to go on the circular road. The friction coefficient between the tyre and the road is negligible.
(a) The car cannot make a turn without skidding. 

(b) If the car turns at a speed less than 40 km/hr, it will slip down.
(c) If the car turns at the correct speed of 40 km/hr, the  force by the road on the car is equal to mv²/r
(d) If the car turns at the correct speed of 40 km/hr, the force by the road on the car is greater than mg as well  as greater than mv²/r

Answer 1

(b) If the car turns at a speed less than 40 km/hr, it will slip down
(d) If the car turns at the correct speed of 40 km/hr, the force by the road on the car is greater than mg as well as greater than mv²/r