The speed of an object moving in a circle is doubled. The centripetal force needed is
A) one-quarter as much as before.
B) half as much as before.
C) twice as much as before.
D) four times as much as before.

Question

Quizplus · Accepted Answer

The centripetal force needed for an object moving in a circle is directly proportional to the square of its speed (F = mv^2/r). Therefore, if the speed is doubled, the centripetal force required becomes four times as much as before.

The Speed of an Object Moving in a Circle Is