Question

In the equation A.(rxF) the r is heading from ______________ and ending at _____________

(a) Axis of rolling, Force vector

(b) Axis of rolling, Force vector’s point of action on the body

(c) Force vector, Axis of rolling

(d) Force vector’s point of action on the body, Axis of rolling

The question was posed to me by my college professor while I was bunking the class.

The query is from Rolling Resistance in division Friction of Engineering Mechanics

Answer 1

Right answer is (b) Axis of rolling, Force vector’s point of action on the body

Best explanation: It is the radius vector. The radius vector is always from the axis of rolling to the point of action of the force on the body. Which means that the radius vector is not on any point on the force vector. Rather it ending at the point on the force vector, where it is being in contact of the body.