Circular motion physics multiple choice question

Question

The reason curves are banked is because:

a) The coefficient of static friction is increased

b) A component of the normal force can contribute to the centripetal force

c) The gravitational force acting on the car is reduced

d) The normal force acting on the car is reduced.

Answer 1

The answer is B

A component of the normal force can contribute to the centripetal force

As the car rounds a bend, the normal force pushes the car torward the center of the curve.

The amount of normal force that contributes to the centripetal force is given by Fnormal*sin(bankangle)=mass*gravitational acceleration*sine(banked angle).

The centripetal force that keeps the car from skidding is due to static friction.

In the absence of enough friction, the car is more likely to skid.

I hope this helps.