Question

If a car is moving forward, what is the direction of the moment of the moment caused by the rolling of the tires, assume non slippery surface?

(a) It is heading inwards, i.e. the direction is towards inside of the car

(b) It is heading outwards, i.e. the direction is towards outside of the car

(c) It is heading forward, i.e. the direction is towards the forward direction of the motion of the car

(d) It is heading backward, i.e. the direction is towards back side of the motion of the car

The question was posed to me in homework.

This interesting question is from Rolling Resistance in chapter Friction of Engineering Mechanics

Answer 1

The correct option is (a) It is heading inwards, i.e. the direction is towards inside of the car

Best explanation: When you curl your wrist in the direction in which the tires are moving then you will find that the thumb is pointing outwards. That is outwards the body of the car. This phenomenon is also observed in rainy seasons. When cars travel on the roads, the water is thrown outside from the tires, due to moment.