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) x time (t)

i.e s = v x 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 in 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 error: