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Lesson 2, Topic 9
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# Measurement of Time, Speed & Temperature

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### Time Measuring Equipment:

A clock is a device for indicating the passage of time or time period. The graduation scales of clocks and watches are in seconds, minutes, and hours.

Units of time:

The basic unit of time is the second (sec.)

60 secs = 1 minute (min.)

60 min  = 1 hour (hr.)

### Measurement of Speed:

Speed is defined as the rate of change of distance with time covered by a moving object. Speed involves the measurement of distance covered over a known time.

Speed (v) = $$\frac{Distance \: covered \: (s)}{Time\: taken\: (t)}$$

i.e v = $$\frac{s}{t}$$

Distance covered (s) = speed (v) × time (t)

i.e s = v × t

Time (t) = $$\frac{Distance \: covered\: (s)}{Speed (v)}$$

i.e t = $$\frac{s}{v}$$

The speed of a moving car is recorded in km/hr (also written as kmh-1) by the car’s speedometer.

### Measurement of Temperature:

Units of temperature: The widely used units of temperature are degree Centigrade (°C) and degree Fahrenheit (°F).

Temperature measuring equipment includes; Mercury – in – glass thermometer, Clinical thermometer.

Evaluation Questions on Uniqueness of Man:

1. State four (4) characteristics of mammals

2. List four (4) special features of primates

3. Enumerates four reasons why man is unique among all animals

4. List 3 uses of intelligence.

5. List 4 (four) characteristics of primate

6. State 3 (three) differences between man and other primates.

7. Explain the expression “all primates are mammals but not all mammals are primates”.

Reading assignment: Spectrum basic science for junior secondary schools, book 2. Pages 30 – 40

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