**PURPOSE: **To demonstrate properties of vectors.

**DESCRIPTION: **Various lengths of magnetic vectors can be affixed in arbitrary positions to a magnetic board. The lengths of the three longer vectors are in the ratio 3:4:5, so that they can form a right triangle. Illustrate vector addition, subtraction, motion of vectors, and commutative properties.

**SUGGESTIONS: **DANGER: Remove vectors before moving boards. For classrooms use the portable version, A2-21.

**REFERENCES: ** (PIRA 1A40.40)

**EQUIPMENT: **Collection of magnetic vectors.

**SETUP TIME: **None.