So - a cylindrical spring is sitting upright on the ground. You grab the top most edge, then start moving your arm in a circular motion. Is that it? Or, is the cylindrical spring sitting in the same manner, and you just grab the top most coil then start rotating the spring?
Sorry if this is the wrong place to ask
A helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end.
Does that make sense to you?
Not my question - a non-native-speaker friend...