What is wrong with the statement "A body cannot rotate when the net force acting on it is zero"?

Answer 1

Because you might push on two different places, thereby inducing a net torque on the body without inducing a net force. So you make it spin without making its center of mass move.
Beyond that, even if you don't exert any torque, a rotating body will keep rotating (conservation of angular momentum) forever until something stops it.

Answer 2

F=ma. The body always has mass, but doesn't always have acceleration. If acceleration is zero, then force is zero. In other words, a body can be spinning, but neither speeding up or slowing down. It takes a force to start or stop a body spinning, but once the force is removed, the body will continue to spin until acted upon by another force.

Answer 3

A body can rotate when the net force on it is zero but a body can not rotate if the net torque on it is zero.

(assuming body is at rest initially and is rigid)

Answer 4

A body can rotate at a constant angular velocity with no net force acting on it. This is trying to test a common misconception of mechanics, that force is necessary to have motion.

Answer 5

Centrifugal rigidity is led to by skill of being in a rotating reference physique. Say I watch somebody on a merry-pass-around. I see them going around in a circle. For something to pass in a circle it desires a rigidity pulling it in direction of the centre, centripetal rigidity. there is not any opposite rigidity, because of the fact if there replaced into then it may be comparable to having no rigidity and the article could pass in a promptly line. (undergo in concepts that turning is acceleration, whether the fee continues to be a similar, and acceleration demands unbalanced rigidity.) Now say i pass and holiday the merry-pass-around and close my eyes. i'm going to think of of myself as sitting nonetheless, no longer likely around in a circle. yet i'm going to experience that i'm being flung outwards, centrifugal rigidity. it particularly is somewhat 2 diverse techniques of finding on a similar situation. the two are the two valid.

Answer 6

The statement is ambiguous, at best.

It is true if the body starts out at rest.
It is false if the body is already rotating.

Answer 7

The main thing that's wrong with the statement, is that it's false.

Answer 8

This is one of Newtons Laws. It is, "An object can not accelerate until a force is acted upon that object"