Zone d’entraide

DeltaPotassium727

Hello! Is the movement of a hand on a clock helical or  a rotation? I don’t understand these two movements, can I have examples of the 2 please?

Thank you!

Katia K

Hello!

In a clock, the hand makes a circular motion around an axis, but the hand does not move along a fixed axis, as a helical motion does. It then performs a rotational movement.

As stated previously, an object makes a rotational movement if it performs a circular movement around an axis. A swing makes a rotational movement, since it rotates around its axis, the part that supports its strings.

Helical motion moves both along and around an axis. A corkscrew is a good example: when the metal spiral enters the cork stopper, it makes both a rotational movement and a translational movement while sinking into the cork!

Hope this helps your understanding!