**Understanding Scalar and Vector Quantities**

- Physical quantities can be grouped into scalar quantities and vector quantities.
- Above Figure shows a truck travelling a distance of 50 km in the eastward direction. We describe the journey of the truck by stating the magnitude and the direction of its travel:

(a) The magnitude is 50 km.

(b) The direction is East. **Scalar quantities**are physical quantities that have**magnitude**only.**Vector quantities**are physical quantities that have**magnitude**and**direction**.- Some examples of scalar and vector quantities are listed in Table.
**Scalar quantities****Vector quantities**Length Displacement Time Velocity Temperature Acceleration Mass Momentum Speed Force

**Example 1**

Mei is putting up a night at a campsite during her training program. It is a warm night with a temperature of 30°C and she will have only 3 hours of sleep before hiking to the base camp of the mountain located 2 km away.

From the above description, determine whether each of the quantities involved is a scalar or a vector quantity and explain your answer.

**Solution:**

Event | Quantity | Explanation |

A warm night with a temperature of 30°C | Scalar quantity | Temperature has magnitude only. |

3 hours of sleep | Scalar quantity | Time has magnitude only. |

Hiking to the base camp 2 km away | Vector quantity | The magnitude of the distance and the direction of the hike are involved. |