Question

A car is moving along a circle with constant speed on an inclined plane as shown in diagram. The friction force on car will be in horizontal direction at least at one point:

• A. In portion ${}^{\prime }A{B}^{\prime }$ including point $A$ and $B$
• B. In portion ${}^{\prime }B{C}^{\prime }$ including point $B$ and $C$
• C. In portion ${}^{\prime }C{D}^{\prime }$ including point $C$ and $D$
• D. In portion ${}^{\prime }D{A}^{\prime }$ including point $D$ and $A$

Answer 1

The correct option is A In portion ${}^{\prime }A{B}^{\prime }$ including point $A$ and $B$

Let's put all the mathematical calculation away and discuss about the idea of " Centripetal force ".
In physics , we use the term " Centripetal force " to describe any forces in the Universe that help something in performing a circular motion. A centripetal forces could be a reaction force , gravitational force or maybe even frictional force. Whatever forces.