Question

Rahul wants to change the motion map shown so that it shows uniform circular motion.

An illustration of a circle with four black dots on the top, bottom, left and right of the circle. Each dot has a vector toward the center of the circle of equal length and a vector tangent to the circle in a counterclockwise direction and of increasing length staring from the one on the right.
What change should Rahul make?

He should change the length of each vector that points toward the center so that it is the same length as the vector pointing tangent to the circle at that point.
He should change the lengths of the vectors that point tangent to the circle so that each is the same length.
He should change the direction of the vectors that are tangent to the circle so that each points away from the center of the circle.
He should change the direction of the vectors that are tangent to the circle so that each points toward the center of the circle.

Answer 1

He should change the lengths of the vectors that point tangent to the circle so that each is the same length.

Reason: uniform circular motion means constant speed, so the tangent (velocity) vectors must have equal magnitude at all points.