Circular MotionHard
Question
A car of mass M is travelling on a horizontal circular path of radius r. At an instant its speed is v and tangential acceleration is a :
Options
A.The acceleration of the car is towards the centre of the path
B.The magnitude of the frictional force on the car is greater than
C.The friction coefficient between the ground and the car is not less than a/g.
D.The friction coefficient between the ground and the car is = tan-1 v2/rg
Solution
at = 
= a
friction force on car =
which is greater than
μmin =
therefore it is not less than
for safe turn.
= afriction force on car =
which is greater than
μmin =
therefore it is not less than
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