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Measurement 1.3

DO NOW: Read The ping-pong balls on page 167. Internal 3 Credits. Measurement 1.3. How would you calculate the volume of all four balls? Length of cardboard tube, in terms of r? Expression for the volume of space inside the tube (hint: think about r)?

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Measurement 1.3

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  1. DO NOW: Read The ping-pong balls on page 167. Internal 3 Credits Measurement 1.3

  2. How would you calculate the volume of all four balls? Length of cardboard tube, in terms of r? Expression for the volume of space inside the tube (hint: think about r)? Volume of empty space inside tube when balls are in it? Write down the ration of all four balls to volume of air inside the tube outside balls? If we have 3 balls, how does the ration change? The ping-pong balls

  3. Go to page 167 and do the following exercises individually: • 1, 3, 6 and 13 Application of what you have learnt so far

  4. Get into teams to do the next set of exercises. One person needs to record the answers and another need to present if called on. Complete exercise 13.04 on page 169. Teamwork

  5. How many forms can H2O take? Solid  volume in cm3 or m3 Liquid  volume usually measured in mL, L or kL . Use term capacity to describe the volume of liquid in a container. CApacity

  6. Capacity The basic unit of capacity is the litre (L). 1 litre (L) = 1000 millilitres (mL) 1 kilolitre (kL) = 1000 litres (L) • When we talk about volumes of liquids we often use the word capacity, rather than volume. Note: Usually use small letters for metric units like mm or cm but exception is L for litres so that we do not confuse it with the number 1. 1 cm3 holds 1 mL  1000 cm3 holds 1000 mL  1000 cm3 holds 1 L Also 1 m3 holds 1 kL (= 1000L) 1 ml of water weighs 1 gm

  7. Lawnmower fuel tank shown right. Calculate capacity in mL. How many times can it be filled using 5 L can of petrol? CApacity • Volume = 15x10x5 = 750 cm3 • 1 cm3 = 1 mL • Volume = 750 ml • Number of times = 5000 mL / 750 mL = 6.6 times • Round to 6 times.

  8. Do the following exercises (14.01 pg 173): • 1, 3, 5, 6, 8, 12, 15, 17 Practice exercises

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