Grade 10 Physical Sciences · Mechanics

Convert units

Change values into the units a formula needs (500 g → 0,5 kg, 25 °C → 298 K, 72 km/h → 20 m/s).

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Metric Unit Prefix Conversions: How to Convert Metric System Prefixes | Crash Chemistry AcademyCrash Chemistry Academy

How To Convert From Km/hr to m/s and m/s to Km/hr - With Shortcut!The Organic Chemistry Tutor

Calculate Kelvin; Celsius to Kelvin; Kelvin to CelsiuschemistNATE

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Question 3.1 · November 2022 · Paper 1 · Provincial · 2 marks

Car A driving at

135

km.h

^{- 1}

approaches a stationery car B. The driver of car B noticed that car A is approaching him at a very high speed. The driver of car B reacted suddenly by accelerating his car from rest at

1, 5

m·s

^{- 2}

for

11, 5

s. After

11, 5

s car B continued driving with a ______. Diagram for this question

3.1 Convert

135

km.h

^{- 1}

to m·s

^{- 1}

.(2)

Work it out on paper first. Then mark yourself with the official memo, one tick at a time.

More past paper questions: convert units

Work each one out first, then open the memo and check every tick.

3. Question 2.3.1 · November 2023 · Paper 1 · Provincial · 3 marks
The diagram below represents a transverse wave with the frequency of $1, 5$ Hz moving from left to right.
2.3 Determine the:
2.3.1 Amplitude of the wave in meter(3)
Show the memo (3 ticks)Memo
1. ✓
  Half the crest-to-trough heightAmplitude $= 0, 5 (20)$
  1 mark · Read wave properties from a diagram
2. ✓
  Amplitude in cm $= 10$ cm
  1 mark · Read wave properties from a diagram
3. ✓
  Convert to metres $= 0, 1$ m
  1 mark · Convert units
4. Question WE3 · Siyavula Grade 10 Physical Sciences, 1.3 Units, Worked example 3 · 2 marks
WE3 Express $3800$ mm in metres.(2)
Show the memo (2 ticks)Memo
1. ✓
  Direction of the conversionMillimetre is smaller than metre: $1$ m $= 1000$ mm, so going from mm to m you divide by $1000$ .
  1 mark · Convert units
2. ✓
  Answer $3800 mm \div 1000 = 3, 8 m$
  1 mark · Convert units
5. Question WE4 · Siyavula Grade 10 Physical Sciences, 1.3 Units, Worked example 4 · 2 marks
WE4 Convert $4, 56$ kg to g.(2)
Show the memo (2 ticks)Memo
1. ✓
  Direction of the conversionKilogram is bigger than gram: $1$ kg $= 1000$ g, so going from kg to g you multiply by $1000$ .
  1 mark · Convert units
2. ✓
  Answer $4, 56 kg \times 1000 = 4560 g$
  1 mark · Convert units
6. Question WE12 · Siyavula Grade 11 Physical Sciences, 11.3 Power and energy, Worked example 12 · 3 marks
WE12 A $30$ W light bulb is left on for $8$ hours overnight, how much energy was wasted?(3)
Show the memo (3 ticks)Memo
1. ✓
  Time in seconds $8$ h $= 8 \times 3600$ s $= 28800$ s
  1 mark · Convert units
2. ✓
  Formula and substitution $E = Pt$
  $E = (30) (28800)$
  1 mark · Calculate electrical power and energy
3. ✓
  Answer with unit $E = 864000$ J
  1 mark · Calculate electrical power and energy

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