Question

Instantaneous Centre of Rotation (ICOR) is the point from where the motion can be analyzed as a pure rotational motion.
(A) True
(B) False

Answer 1

Hint: This question uses the concept of Instant center of rotation, which is a part of rotational dynamics. Pure rotational motion means that the system travels across the fixed axis, which is vertical to the fixed plane.

Complete step by step answer:
Instantaneous Centre of Rotation, also known as ICOR, is a point in a system from which the motion can be examined as pure rotational motion. If we consider a wheel, we know that the motion of the wheel comprises translational motion with that of rotational motion. So here, ICOR is a point which helps us to examine whether the motion is pure rotational or not. It is a fixed point in the system, which has zero velocity at a certain instant of the time interval. Further, the point undergoes a planar movement. At this instant of time, velocity vectors of another point in the system produce a circular field that is similar to that of pure rotational motion. Suppose we consider the lowest point in a wheel, where its velocity is zero. When we perform analysis of the motion of that point, then at that instant the wheel will have a pure rotational motion about that particular point.

So, the correct answer is “Option A” and the given statement is “TRUE”.

Note:
You need to choose a unique point in a system which has zero velocity. After choosing the point, you need to consider that the whole system is in pure rotation with the axis. The intersection of this axis with the plane of motion of the system is known as ICOR. This can help in solving other problems also.