As an automobile turns a corner on a level road, the centripetal force necessary
ID: 1784787 • Letter: A
Question
As an automobile turns a corner on a level road, the centripetal force necessary to keep the automobile in the turn is provided by:
(A) the gravitational force of the Earth
(B) the normal force of the road
(C) the friction force of the road
(D) inertia
Studies of traffic accidents on a particular curve lead to measures to reduce the number of vehicles going off the curve when the road is slick. Which of the following measures would be most effective in reducing such accidents?
(A) Reducing the speed limit for large vehicles, allowing only small vehicles to travel at regular speed.
(B) Creating a banked curve so that the road slopes downward on the outside of the curve.
(C) Decreasing the radius of the curve so that the distance around the curve is less.
(D) Creating a banked curve so that the road is higher on the outside of the curve.
Explanation / Answer
a)During the turn, the car travels in a circular path. The friction force acting upon the turned wheels of the car causes an unbalanced force upon the car and a subsequent acceleration. The unbalanced force and the acceleration are both directed towards the center of the circle about which the car is turning. Your body however is in motion and tends to stay in motion. It is the inertia of your body - the tendency to resist acceleration - that causes it to continue in its forward motion
Hence option (D) is correct.
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