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# Help Zone

### Student Question

Secondary I • 2yr.

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!

Science

## Explanations (1)

• Explanation from Alloprof

Explanation from Alloprof

This Explanation was submitted by a member of the Alloprof team.

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Team Alloprof • 2yr.

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!