Question

Rahul wants to change the motion map shown so that it shows uniform circular motion. What change should Rahul make?

A. 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.

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

C.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.

D.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

B

Step-by-step explanation:

Answer 2

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

Step-by-step explanation:

A uniform circular motion is a motion in a circle where the tangential speed of the object is constant.

In the motion map:

- The arrows pointing towards the centre of the circle represent the centripetal acceleration, and their length represent the magnitude of the acceleration

- The arrows pointing tangential to the circle represent the tangential speed, and their length represent the magnitude of the speed

In this motion map, we see that the length of the vectors pointing tangent to the circle is not constant: this means that the speed is not constant. In order to have a uniform circular motion, the speed must be constant, therefore the lengths of the vectors that point tangent to the circle must be the same.