A car of mass m attempts to go on the circular road of radius r, which is banked for a speed of 36 km/hr. 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 36 km/hr, it will slip down
C
If the car turns at the constant speed of 36 km/hr, the force by the road on the car is equal to 
D
If the car turns at the correct speed of 36 km/hr, the force by the road on the car is greater than mg as well as greater than
Text Solution
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(b, d) When speed of car is 36 km/hr, car can make a turn without skidding. If speed is less than 36 km/hr than tendency of slipping is downward so it will slip down. If speed is greater than 36 km/hr than tendency of slipping upward so it will slip up.
If the car ’ s turn at correct speed 36 km/hr
N cos 
= mg
N sin 
= 
N = 
Ans.
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