When wind applies a force to a pinwheel, the arms of the pinwheel start to move in a circular motion. Which additional force keeps the arms of the pinwheel moving in a circular motion?

The reaction force from the shaft, which keeps the wheels in place during operational rotation

Explanation:

The pinwheel design which has the same principle of a turbine, relies on a external energy source such as the wind or water to provide motive force for spinning

Whereby the reaction force provided by the shaft holding the wheel is non existent or insufficient, the wind will be able to push the wheel in its direction thereby giving the wheel only a net translation and no rotation.

hypothesising or postulating

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.