Fill the rotational motion board

Exercise and reference answers

Clues and terms

1. Clue

   Body in which the distances between all pairs of particles never change.

   Item

   Rigid body

2. Clue

   The fixed line about which a body that cannot slide is able to turn.

   Item

   Rotation axis

3. Clue

   Sweeping of a spinning top's axis around the vertical through its tip.

   Item

   Precession

4. Clue

   Rotational analogue of force, measured in newton metre.

   Item

   Torque

5. Clue

   Two equal opposite forces on different lines, turning a body without moving it.

   Item

   Couple

6. Clue

   Point that moves as if all the mass and all external forces sat there.

   Item

   Centre of mass

7. Clue

   Light rod pivoted along its length, with a load arm and an effort arm.

   Item

   Lever

8. Clue

   The pivot of an ideal lever, about which the moments are taken.

   Item

   Fulcrum

9. Clue

   Heavy disc in an engine whose large moment of inertia smooths speed changes.

   Item

   Flywheel

Instructions

A clue is called out each turn. Tap the cell it names. Three marks in a line wins.

Explanation